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

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The number of North American children who are obese that is, [#permalink]  16 Nov 2012, 05:42
Expert's post
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35% (medium)

Question Stats:

56% (02:04) correct 43% (01:57) wrong based on 39 sessions
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

Source Jamboree
[Reveal] Spoiler: OA

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Re: North American Children [#permalink]  16 Nov 2012, 06:25
Expert's post
santhoshnebalan wrote:

Please post as if you are a member of a forum and not a polling office. Here you are to provide your explanations not just to cast your vote.
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Re: North American Children [#permalink]  16 Nov 2012, 07:16
Marcab wrote:
santhoshnebalan wrote:

Please post as if you are a member of a forum and not a polling office. Here you are to provide your explanations not just to cast your vote.

Well I can but without knowing the correct answer how can i tell my logic will be an exact correct one
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Re: North American Children [#permalink]  16 Nov 2012, 07:21
Marcab wrote:
santhoshnebalan wrote:

Please post as if you are a member of a forum and not a polling office. Here you are to provide your explanations not just to cast your vote.

dude chill...! and lol...

So the answer should be C.

questions says -> more body fat than do 85 percent of North American children their age
obese is calculated relatively
if there were 100 children, top 15 i.e who weight the more than the other 85 are called obese.
Now if this 15 has increased say to 45 then a simple math would reveal the total children (and also the non-obese children count have also increased!

Total * 15% = 45
Total =300
300-45 = 255
before 100-15 = 85
now 255

C says -> the number of North American children who are not obese increased over the past 15 years. - PERFECT MATCH.

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Re: North American Children [#permalink]  16 Nov 2012, 07:37
Marcab 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

Source Jamboree

OA after discussions.

Basically obese kids have been places at 85th percentile. That is top 15% with body fat are called obese. Since the percentile is fixed and yet the number of obese is increasing. That means the overall population of set is increasing.
=> 85% will also increase correspondingly -which constitues non obese kids. Which is exactly explained in C.

Ans C it is.
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Re: North American Children [#permalink]  16 Nov 2012, 08:50
If X is the population of North American Children.
15% of X are Obese as they have more body fat than those of 85% of X.
If 15% of X is increasing, X must be increasing. Thus, 85% of X will also increase.
C states the same.
Re: North American Children   [#permalink] 16 Nov 2012, 08:50
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