又一个问题[求助]

nan

狒狒宝点的地114题.
the number of North American children who are obese-that is, who have more body fat than do 85% of North American children their age-is ateadily incresing, according to four major studies conducted over past 15 years.
if the finding reported above is correct, it can be properly concluded that:
the answer is C: the number of Northan American children who are not obese increase over tha past 15 years

why is C???
颇哲号后的内容 不是修饰胖孩资吗?

zyh79

对胖子的定义是比85%的人重，
那么现在胖子的绝对人数增加了，仍要满足85%的定义，瘦子的人数也要增加。
比如，原来100，胖子15；现在胖子30人，总人数也相应变化为200人。

nan

thanks!