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The number of North American children who are obese-that is,

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Re: The number of North American children who are obese-that is, [#permalink]

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New post 11 Dec 2015, 14:28
pkm9995109794 wrote:
the answer "c" is not convincing
rate of increase for obese children -10%
Case 1 Total number of children increases

------------Obese-----Non-Obease------Total
Year-1---- 10--------90----------------100
Year-2-----11--------90----------------101
Year-3---- 12--------90----------------102
Year-4---- 13--------90----------------103



Case 2 Total number of children constant
------------Obese-----Non-Obease--------Total
Year-1---- 10-------- 90----------------100
Year-2---- 11-------- 89-----------------100
Year-3---- 12---------88-----------------100
Year-4---- 13--------87----------------- 100


it is not mentioned that total number of children are increasing/decreasing.In both case Number on nonobese children need not increase


If I am not mistaken, you have to keep in mind that the more obese you introduce into the system the value (body fat %) of what constitutes the 85th percentile increases.

If that happens you start seeing the number of people who was once considered obese becoming non-obese.

Just like the GMAT, if a substantial amount of people all of a sudden started scoring 800's, the more likely it is that I wont get into a top school anymore with my old score because my score potentially could no longer be considered high scoring.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 27 Feb 2016, 02:51
If no of children who are not obese increases then the percentage of obese children should go down.
How can C be the correct answer?
Please help! I am comprehend the logic behind C.

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Re: The number of North American children who are obese-that is, [#permalink]

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New post 28 Feb 2016, 01:45
KAUSTAV89 wrote:
If no of children who are not obese increases then the percentage of obese children should go down.
How can C be the correct answer?
Please help! I am comprehend the logic behind C.

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Number of children who are obese (more fat than 85% of the total children) increased.
It means that the number of the 15% fattest kids increased.
-> the 85% of non-fattest kids increased too, since both are a percentage on the total number of children. If 15% increased, then 85% increased too.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 28 Feb 2016, 02:07
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boksana wrote:
114. The number of North American children who are obese-that is, who have more body fat than do 85 percent of North American children their age is steadily increasing, according to four major studies conducted over the past 15 years.


If the finding reported above is correct, it can be properly concluded that

(A) when four majors studies all produce similar results, those studies must be accurate

Out of scope, we are not at all concerned about the accuracy of the information.

(B) North American children have been progressively less physically active over the past 15 years

We do not know whether physical activity contributes to children not being obese / there are any other factors.

(D) over the past 15 years, the number of North American children who are underweight has declined

Weight has got nothing to do with obesity , check carefully we are considering body fat not weight.

(E) the incidence of obesity in North American children tends to increase as the children grow older

We do not have any information to infer this, out of scope.

(C) the number of North American children who are not obese increased over the past 15 years

Total No of Children = Obese Children + Non Obese Children

If number of Obese children are increasing ( keeping the total number of children same) then the number of non obese children must decrease.

Hence IMHO (C) undoubtedly
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 16 May 2016, 23:08
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Abhishek009 wrote:
boksana wrote:
114. The number of North American children who are obese-that is, who have more body fat than do 85 percent of North American children their age is steadily increasing, according to four major studies conducted over the past 15 years.


If the finding reported above is correct, it can be properly concluded that

(A) when four majors studies all produce similar results, those studies must be accurate

Out of scope, we are not at all concerned about the accuracy of the information.

(B) North American children have been progressively less physically active over the past 15 years

We do not know whether physical activity contributes to children not being obese / there are any other factors.

(D) over the past 15 years, the number of North American children who are underweight has declined

Weight has got nothing to do with obesity , check carefully we are considering body fat not weight.

(E) the incidence of obesity in North American children tends to increase as the children grow older

We do not have any information to infer this, out of scope.

(C) the number of North American children who are not obese increased over the past 15 years

Total No of Children = Obese Children + Non Obese Children

If number of Obese children are increasing ( keeping the total number of children same) then the number of non obese children must decrease.

Hence IMHO (C) undoubtedly


Hi Abhishek009

How do you know total is same?

also option C says num of non-obese children is increasing but you took it as decreasing..

please explain
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The number of North American children who are obese [#permalink]

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The number of North American children who are obese, that is who have more body fat than do 85 percent of North American children their age, is steadily increasing according to four major studies conducted over the past 15 years.

If the finding reported above is correct, it can be properly concluded that

(A) when four major studies all produce similar results those studies must be accurate.

(B) North American children have been progressively less physically active over the past 15 years.

(C) The number of North American children who are not obese increased over the past 15 years.

(D) Over the past 15 years, the number of North American children who are underweight has declined.

(E) The incidence of obesity in North American children tends to increase as the children grow older.

Originally posted by ishajindal on 24 May 2016, 22:37.
Last edited by Vyshak on 25 May 2016, 01:38, edited 4 times in total.
Formatted the question
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Re: The number of North American children who are obese [#permalink]

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New post 24 May 2016, 22:48
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Children are obese if their body fat is more than 85 percent of children of their age --> 15% of children are obese and rest 85% are not obese

The number of children who are obese has increased --> since the 15 : 85 ratio does not change any increase in the number of obese children will lead to an increase in the number of children who are not obese.

Answer: C
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Re: The number of North American children who are obese [#permalink]

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New post 24 May 2016, 23:42
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Vyshak wrote:
Children are obese if their body fat is more than 85 percent of children of their age --> 15% of children are obese and rest 85% are not obese

The number of children who are obese has increased --> since the 15 : 85 ratio does not change any increase in the number of obese children will lead to an increase in the number of children who are not obese.

Answer: C

Since the question is about numbers and percentages, best approach is to do this in quant way .

Ratio of not obese to obese is 85/15

85% not obese and 15% obese .

Lets say initial number is 100 , thus 85 not obese and 15 obese .

Now as per question lets say number of obese increases to 30 , then in order to maintain the ratio of 85/15 . The numerator (85) must increase to 170 .

Thus, C is the only correct answer we can conclude .

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Re: The number of North American children who are obese [#permalink]

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New post 25 May 2016, 01:24
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On this board, the rules are created to be followed. And they are mandatory. No exceptions.

This topic lacks the few, nonetheless, essential rules :

- at least 3 tags
- a proper title
- a good formatting

From now ongoing this kind of post will be deleted right away and the kudos rewarded, as well. Moreover, the mods that reply to this kind of post is strongly recommended to take proactive actions in such behaviour.

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Re: The number of North American children who are obese [#permalink]

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New post 25 May 2016, 01:32
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carcass wrote:
On this board, the rules are created to be followed. And they are mandatory. No exceptions.

This topic lacks the few, nonetheless, essential rules :

- at least 3 tags
- a proper title
- a good formatting

From now ongoing this kind of post will be deleted right away and the kudos rewarded, as well. Moreover, the mods that reply to this kind of post is strongly recommended to take proactive actions in such behaviour.

Regards


Hi carcass,

Since I answered it via tapatalk, I was not aware that the question was posted in the wrong forum. I have moved the topic to CR and I have fulfilled the necessary requirements to keep this post in the forum.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 27 May 2016, 04:16
actually, when i saw the question i thought total number of children has been increasing. but, in C, how can one say non- obese children are increasing? it can be increase in total number of children increase, without increase in non-obese but just increase in obese. please explain.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 07 Jun 2016, 23:41
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Abhishek009 wrote:
boksana wrote:
114. The number of North American children who are obese-that is, who have more body fat than do 85 percent of North American children their age is steadily increasing, according to four major studies conducted over the past 15 years.


If the finding reported above is correct, it can be properly concluded that

(A) when four majors studies all produce similar results, those studies must be accurate

Out of scope, we are not at all concerned about the accuracy of the information.

(B) North American children have been progressively less physically active over the past 15 years

We do not know whether physical activity contributes to children not being obese / there are any other factors.

(D) over the past 15 years, the number of North American children who are underweight has declined

Weight has got nothing to do with obesity , check carefully we are considering body fat not weight.

(E) the incidence of obesity in North American children tends to increase as the children grow older

We do not have any information to infer this, out of scope.

(C) the number of North American children who are not obese increased over the past 15 years

Total No of Children = Obese Children + Non Obese Children

If number of Obese children are increasing ( keeping the total number of children same) then the number of non obese children must decrease.

Hence IMHO (C) undoubtedly



This logic is flawed. You are saying total no. of children is same ( not possible)


From the argument :

Definition of obesity : bf> 85% of NA kids. So 85% people always need to have bodyfat less than whatever is the current obesity level.


85% = no. of non obese/ (no. of obese + no. of non obese)

So if no. of obese is increasing, to keep the 85% constant. no. of non obese has to increase as well. Else there will be a drop in 85%.

Clearly C
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 07 Jun 2016, 23:45
aimkp wrote:
74. The number of North American children who are obese, that is who have more body fat than do 85 percent of North American children their age, is steadily increasing according to four major studies conducted over the past 15 years.
If the finding reported above is correct, it can be properly concluded that
(A) when four major studies all produce similar results those studies must be accurate.
(B) North American children have been progressively less physically active over the past 15 years.
(C) The number of North American children who are not obese increased over the past 15 years.
(D) Over the past 15 years, the number of North American children who are underweight has declined.
(E) The incidence of obesity.



From the argument :

Definition of obesity : bf> 85% of NA kids. So 85% people always need to have bodyfat less than whatever is the current obesity level.


85% = no. of non obese/ (no. of obese + no. of non obese)

So if no. of obese is increasing, to keep the 85% constant. no. of non obese has to increase as well. Else there will be a drop in 85%.

Clearly C
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 21 Jul 2016, 03:18
I chose the wrong one, but agreed that C is the correct answer after the calculation. Let's see the statistics:


year------------------------# of children------obese-------non-obese--------obese%
one of the 15 years---------1000-------------150---------850--------------- 15%
another year-----------------2000-------------300---------1700------------- 15%

To conform to the 15% data, the numbers of both obese and non-obese children should increase.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 01 Apr 2017, 04:05
Total Number of Children = Obese + Non-Obese

Relationship: Obese children have fat > than 85 percent of North American children their age.

Comparison is within the same age group and hence E is out.

If obese children are growing , then non-obese will also grow. Lets say out of 100 children - 15 are deemed obese and 85 are non-obese. If the number ought to increase within the same age group, then either some kids should transition from non-obese to obese with total constant or total increases and so does both quantities i.e. obese and non-obese. Since the studies are concluded on the bases of a survey over last 15 years, it is highly unlikely that total will remain constant and hence latter holds true and it can be concluded that both groups are increasing.

C
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 22 Apr 2017, 07:08
The number of North American children who have more body fat than 85% of children their age is always 15% of the children that age.

So this number, which is always 15% of children, increased. This can only mean that the 100% of children increased, meaning also the remaining 85% (children who are not obese) increased.

Let population be x 15 years ago
Number of Obese children 15 years ago = .15x (15% of x)
Number of Non Obese Children 15 years ago = .85x(85% of x)

Let population today be y
Number of Obese children today = .15y(15% of y)
Number of Non Obese children today =.85y(85% of y)

Acc to Stimulus ->
Number of Obese children today > Number of Obese children 15 years ago
.15y>.15x
this implies y > x
so .85y > .85x
Number of Non Obese children today > Number of Non Obese Children 15 years ago
so C is valid
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 22 Apr 2017, 07:12
arirux92 wrote:
Abhishek009 wrote:
boksana wrote:
114. The number of North American children who are obese-that is, who have more body fat than do 85 percent of North American children their age is steadily increasing, according to four major studies conducted over the past 15 years.


If the finding reported above is correct, it can be properly concluded that

(A) when four majors studies all produce similar results, those studies must be accurate

Out of scope, we are not at all concerned about the accuracy of the information.

(B) North American children have been progressively less physically active over the past 15 years

We do not know whether physical activity contributes to children not being obese / there are any other factors.

(D) over the past 15 years, the number of North American children who are underweight has declined

Weight has got nothing to do with obesity , check carefully we are considering body fat not weight.

(E) the incidence of obesity in North American children tends to increase as the children grow older

We do not have any information to infer this, out of scope.

(C) the number of North American children who are not obese increased over the past 15 years

Total No of Children = Obese Children + Non Obese Children

If number of Obese children are increasing ( keeping the total number of children same) then the number of non obese children must decrease.

Hence IMHO (C) undoubtedly



This logic is flawed. You are saying total no. of children is same ( not possible)


From the argument :

Definition of obesity : bf> 85% of NA kids. So 85% people always need to have bodyfat less than whatever is the current obesity level.


85% = no. of non obese/ (no. of obese + no. of non obese)

So if no. of obese is increasing, to keep the 85% constant. no. of non obese has to increase as well. Else there will be a drop in 85%.

Clearly C


Since the number of obese children and the number of non-obese children are both increasing, the total population of children must also be increasing.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 29 Apr 2017, 08:47
Since it says number of children who are overweight increases
Overweight those who have weight more than 85% , if 85% n now corresponds to a higher number, so shall 15 %.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 29 Apr 2017, 12:33
boksana wrote:
114. The number of North American children who are obese-that is, who have more body fat than do 85 percent of North American children their age---is steadily increasing, according to four major studies conducted over the past 15 years.

If the finding reported above is correct, it can be properly concluded that

(A) when four majors studies all produce similar results, those studies must be accurate
(B) North American children have been progressively less physically active over the past 15 years
(C) the number of North American children who are not obese increased over the past 15 years
(D) over the past 15 years, the number of North American children who are underweight has declined
(E) the incidence of obesity in North American children tends to increase as the children grow older

A. Incorrect-No such evidence in the argument.
B. Incorrect-No correlation between physical fitness and body fat have been established.
C. Correct- Ratio of Non-obese to obese is 85/15 always. If # of obese increases then so does # of non-obese.
D. Incorrect-No correlation between weight and body fat have been established. One possible case is- less body fat means more muscle and thus more weight.
E. Incorrect- Age of those children has not been mentioned.
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Re: The number of North American children who are obese-that is, [#permalink]

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New post 15 Feb 2018, 09:30
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Re: The number of North American children who are obese-that is,   [#permalink] 15 Feb 2018, 09:30

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