一道LSAT

Kilroy

The number of North American children who are obese- that is who hv 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 hv 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.



Answer:C   这道题更象是一到数学题。这样可以比较清晰的推出呢？

zyh79

肥胖人的定义是其体重超过了总数85%的人，换句话说，肥胖人只占比例为15%
现在，肥胖人绝对数增多了，若仍要维持15%，则不肥胖人也要增多。

Kilroy

但肥胖人增加的也是比例啊？

zyh79

not 比例， but the number