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Someone help me out here? I have a vague understanding of why C is the right answer, though I naively selected A. Best explanation I could come up with is that there will always be not obese kids being born into the population, regardless of the percentage increase of obese kids.
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C is not the right answer for PT5.S3.Q18, A is.
Wrong question number. Sorry. I was actually wondering about 12, the obese kids.
Quick correction: This is PT5.S3.Q12.
I will follow up with a response to your question!
@BenjaminSF Thanks Bay Area bro. Subject line updated.
This question relies on the reader's ability to relate percentages to absolute numbers.
So we know that OC are defined by a weight greater than 85% of other C (or /OC).
Lets say we have exactly 15 OC and 85 /OC to start. The passage states that the number of OC is increasing. So let's say 15 years later there are 30 OC. That means that we have 30 C that are heavier than 85% of all /OC. So that means that the 30 OC are 15% of all C. Therefore, we can conclude that there must be more non-obese children for this relationship to remain true. Now we have 170 /OC.
The definition for OC remains constant, always 15%. For this reason, (C) has to be true. If it were not true, then the facts in the stimulus would be broken.
@BenjaminSF
I don't understand.15 OC and 85/OC means 15 kids have 85% more body weight than the other 85 /OC kids. Going up to 30 OC. You have 30 kids that have 85% more body weight than who? Is it the same 85 /OC kids? Does it shift to 30 OC and 60 /OC?Edit: I think I might have it. If 15 goes up to 30 and they're both still 15%, then the 85 /OC has to go up to 170 for 30 OC to still be 15%. 15% of 200 is 30. Got you. Thanks Benjamin.
Happy to help @"Aaron Frank" !
great help