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The number of North American children who are obese

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rajcools Rising GMAT Star Default Avatar
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The number of North American children who are obese Post Sat Apr 28, 2012 9:58 am
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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.

    OA after some discussion.. Try it guys ull enjoy it

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    GMAT Kolaveri Really wants to Beat The GMAT!
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    Post Sat Apr 28, 2012 10:20 am
    (A) when four major studies all produce similar results those studies must be accurate. Too strong statement. incorrect. logically this cannot be correct.
    (B) North American children have been progressively less physically active over the past 15 years. Fails the FACT Test.
    (C) The number of North American children who are not obese increased over the past 15 years. Cannot be inferred from the premise. the premise speaks about percentage.
    (D) Over the past 15 years, the number of North American children who are underweight has declined. Cannot be inferred from the premise. the premise speaks about percentage.
    (E) The incidence of obesity in North American children tends to increase as the children grow older. i dont find anything wrong with this AO.

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    rajcools Rising GMAT Star Default Avatar
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    Post Sat Apr 28, 2012 10:47 am
    E) is wrong... how does obesity increase as children grow older

    OA is C

    vk_vinayak GMAT Destroyer!
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    Post Sat Apr 28, 2012 11:56 am
    I also had voted for E. But closely reading again, I stand corrected. It should be C.

    Obese children mean children having more body fat than 85% of children. Obese is expressed in terms of rest of the children. If number of obese has increased then it must be true that number of non-obese has increased.

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    rajcools Rising GMAT Star Default Avatar
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    Post Sat Apr 28, 2012 12:30 pm
    Quote:
    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
    (C) The number of North American children who are not obese increased over the past 15 years.
    Explanation for C --

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

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

    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

    rajcools Rising GMAT Star Default Avatar
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    Post Sat Apr 28, 2012 12:32 pm
    Quote:
    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
    (C) The number of North American children who are not obese increased over the past 15 years.
    Explanation for C --

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

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

    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

    patanjali.purpose GMAT Destroyer! Default Avatar
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    Post Sat Apr 28, 2012 12:57 pm
    rajcools 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.

    OA after some discussion.. Try it guys ull enjoy it
    I think we address this by simply focusing on what the argument is talking. Argument is only about OBESITY

    A- accuracy of studies IS NOT THE DISCUSSION POINT. We cannot infer whether studies are accurate or not from the given statment

    B - argument is about OBESITY (not about PHYSICAL ACTIVITY); Stimulus does not say anything about whether OBESITY IS LINKED WITH PHYSICAL ACTIVITY or not

    D - UNDERWEIGHT not discussed

    E - we cannot say whether obesity increases with age from the stimulus

    Only C remains

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