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

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

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18 Jul 2004, 09:51
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50% (03:07) correct 50% (01:28) wrong based on 1009 sessions

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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 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
[Reveal] Spoiler: OA

Last edited by nguyendinhtuong on 02 Jun 2017, 08:11, edited 2 times in total.
OA updated
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Re: The number of North American children who are obese-that is, [#permalink]

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18 Jul 2004, 10:12
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we have 15% obese children. or 15 out of 100.
consider that the children population increased to 200. This means, children population will have 30 obese children.

number of obese children is directly proportional to children population. we know that the number of obese is increasing, in turn the number of non-obese.
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Re: The number of North American children who are obese-that is, [#permalink]

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18 Jul 2004, 11:13
D (1min 42 s)

that was my answer, but I now think that "underweight" has no relevance to the argument. Ans should be C
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Re: The number of North American children who are obese-that is, [#permalink]

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18 Jul 2004, 20:56
1 min & C. Agree with dj's explanation.
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Re: The number of North American children who are obese-that is, [#permalink]

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18 Jul 2004, 23:23
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C here. I am not sure if DJ's explanation is correct or not (are we sure that the number of children has increased?), but me still thinks C is the best choice
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Re: The number of North American children who are obese-that is, [#permalink]

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19 Jul 2004, 01:14
I opted for (D), but after reading DJ's explanation, (C) looks better.

(Such kind of CR's are my weakness, CR's that talk about percentage and all. Any advice how to crack these!!)
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Re: The number of North American children who are obese-that is, [#permalink]

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19 Jul 2004, 10:38
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The OA is C
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Re: The number of North American children who are obese-that is, [#permalink]

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17 Dec 2010, 07:06
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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.
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Re: The number of North American children who are obese-that is, [#permalink]

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17 Dec 2010, 12:41
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.

Hi again!

Another inference question, so the same rules apply - we're looking for a statement that MUST be true based on one or more of the facts in the stimulus.

We start by paraphrasing the stimulus:

Four major studies tell us that the NUMBER (my emphasis) of N.A. children who are obese is steadily increasing. Obesity is defined as children heavier than 85 PERCENT (my emphasis) of their peers.

On most inference questions, it's very difficult to predict the correct answer (since, on the basis of a bunch of facts, there's usually numerous conclusions that can be drawn). Here, however, if we notice the distinction between numbers and percents, we may be able to make a rough prediction.

If obesity is a relative concept (i.e. it's not a fixed weight, it's your weight relative to the weight of others), how can the group comprising that top 15% get bigger? Only if the entire pool of children grows.

So, our prediction: there must be more children now than there were previously.

Going through the choices, (C) should jump out as the clear winner - not an exact match for our prediction, but following the same logic.

A quick look at the other choices:

A) "must be accurate" - too extreme, eliminate.
B) we have no info on the causes of obesity - outside the scope, eliminate.
D) we have no info on how the other 85% of children are distributed (maybe all 85% are underweight) - outside the scope, eliminate.

Remember, the correct answer to an inference question MUST be true; if you read a choice and think "well, this COULD be true, but I'm not sure", then you can confidently eliminate that choice.
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*700* The number of North American children [#permalink]

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11 Apr 2015, 23:24
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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
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*700* The number of North American children [#permalink]

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11 Apr 2015, 23:24
Expert's post
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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
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Re: *700* The number of North American children [#permalink]

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11 Apr 2015, 23:59
souvik101990 wrote:
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

Note we are tazlking about a percentage of the population of children. This means that if the population increases so will the number of children who fall under "15% children who have a bodyfat which is more than 85% of children". In this sense, it would be a stretch to say that the incidence of childhood obesity is increasing in the US. The incidence of childhood obesity would be considered to be increasing in the US, had the obese children population been over 15%. But we are using a relative measure. It may be possible that the 85% has a body fat of 23% (or normal) 15 years ago and a body fat of 30% (or obese) today, while those in the higher 15% had a body fat of 40% (or morbidly obese) 15 years ago and a body fat of 35% (or obese) today. We can make innumerable conclusions out of the given statement.

But the only statement that we can conclusively make from the statement is C. Since we are talking about percentage of population, the only way the total number under a given percentage of population can increase is if the overall population has increased. So in the same sense 85% of population will also carry more numbers.

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Re: *700* The number of North American children [#permalink]

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12 Apr 2015, 00:57
C? I need help
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Re: *700* The number of North American children [#permalink]

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12 Apr 2015, 08:15
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

C Vs D. Rest r out for obvious reasons.

As per premise:
[Same age NAC ] ====<85% not obese>=====||==<15% obese>==.

# of NAC in blue mark has increased. Now to maintain the same proportion we need to increase # of NAC in green marked category. Overall entire population of NAC increased.

C is the winner.
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*700* The number of North American children [#permalink]

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15 Apr 2015, 09:39
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The best way to approach this problem is mathematically ( ) -

Let population 15 years ago = x
Number of Obese children 15 years ago = .15x or 15%
Number of Non Obese Children 15 years ago = .85x or remaining

Let population today = y
Number of Obese children today = .15y
Number of Non Obese children today =.85y

According to Stimulus ->
Number of Obese children today > Number of Obese children 15 years ago
or .15y>.15x
=> y > x
Therefore, .85y > .85x
i.e Number of Non Obese children today > Number of Non Obese Children 15 years ago

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Re: *700* The number of North American children [#permalink]

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15 Apr 2015, 10:36
souvik101990 wrote:
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

This is a conclusion based question.

Premises in short :
1. Number of obese children in America is increasing based on 4 study over last 15 years (fact)
2. Number of obese = who have more body fat than do 85 percent of North American children their age (fact)

We know Number of obese is increasing , so the conclusion will be based on unstated fact , which is Number of on obese.

2 year back : total 100 OB=15 , non OB=85
1 year back : total 200 OB=30 , non OB=170

Since obese number is proportionate of non obese , as obese number increases non obese will also increase

A . Passage only said 4 studies were conducted , based on the information we can not conclude A
B. out of scope , we can not introduce any reason for obesity as passage did not mentioned anything related to cause of obesity.
C. Correct
D. Opposite , if the non obese people were decreased than obese number were also decreased as it is on proportion
E. Out of scope , nothing mentioned on the passage based on which we can say that
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Re: *700* The number of North American children [#permalink]

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16 Apr 2015, 04:01
arkle wrote:
The best way to approach this problem is mathematically ( ) -

Let population 15 years ago = x
Number of Obese children 15 years ago = .15x or 15%
Number of Non Obese Children 15 years ago = .85x or remaining

Let population today = y
Number of Obese children today = .15y
Number of Non Obese children today =.85y

According to Stimulus ->
Number of Obese children today > Number of Obese children 15 years ago
or .15y>.15x
=> y > x
Therefore, .85y > .85x
i.e Number of Non Obese children today > Number of Non Obese Children 15 years ago

Hi arkle
You explanation helped..!!
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Re: *700* The number of North American children [#permalink]

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03 May 2015, 17:03
Imagine that there are 100 kids, and 15 kids have more body fat than 85 of the others. Those 15 are obese.

Now, let's imagine that the number of obese kids jumps to 30. Can we just say that those 30 kids have more body fat than the remaining 70 kids? What's the problem with that? Think about that before reading on.

If we have a 30-70 split, than some of those 30 kids are not qualifying as obese. For example, the least fat kid among that 30 will have more body fat than 60 percent (since 60/100 is 60%). So, to have the number of obese kids jump from 15 to 30, we would need the number of non-obese kids to jump too
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Re: The number of North American children who are obese-that is, [#permalink]

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03 May 2015, 17:05
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Re: The number of North American children who are obese-that is, [#permalink]

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03 Sep 2015, 08:36
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