求助大家，看看这道逻辑题选什么？

cocostea

The number of North American children who are obese – that is, whohave more body fat than do 85 percent of North American children their age – issteadily increasing, according to four major studies conducted over the past 15years. Ifthe finding reported above is correct, it can be properly concluded that:
?    A) when four major studies all produce similar results, thosestudies must be accurate.
?    B) North American children have been progressively less active overthe past 15 years.
?    C) the number of North American children who are not obese increasedover the past 15 years.

?    D) over the past 15 years, the number of North American children whoare underweight has declined.
?    E) the incidence of obesity in North American children tends toincrease as the children grow older.

connie飘着

o, i c. actuall i just know a is irrelevant. now i know, tks

cocostea

it makes sense, thank you

sdcar2010

LS almost got it right.

Number of overweighted children = (100%-85%)*Number of all children

So if Number of overweighted children is up, so is Number of all children. But the overweight rate is always 15%.

Then Number of Not-obese children = 85% * Number of all children. If Number of all children is up, so is the Number of not-obese children.

camelo777

注意理解题目，题目对于obese的定义是who have more body fat than do 85 percent of North American children their age，也就是说肥胖的定义是比85%的孩子要胖，那么既然肥胖的比率在上升，说明总的孩子的比率在上升，因此抛去肥胖的孩子，不胖的孩子数量肯定也在增加，因此C正确

cocostea

答案是C，弄不懂为啥！有同学看出来原因的吗？

connie飘着

我觉得选a吧。答案是什么呢？