pp2-ps-43 (求救~~~百分比)

Kath1985 · 发表于 2010-4-15 19:59:11

43.5837-!-item-!-187;#058&004612

A college admissions officer predicts that 20 percent of the students who are accepted will not attend
the college.According to this prediction, how many students should be accepted to achieve a planned enrollment of x students?

(A) 1.05x

(B) 1.1x

(C) 1.2x

(D) 1.25x

(E) 1.8x

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【答案】D
看過PP解釋還是不懂
我的算法是原先錄取人數為 y
會去唸的 0.8x 不會去唸的 0.2x
那麼要補足錄取人數再把0.2x的名額補滿就好了呀答案怎麼不是0.2x呢?

stucash · 发表于 2010-4-15 20:07:02

额..这样看看...

设要录取的人是Y; 那么Y-0.2Y=X;

0.8Y=X>>>>>>8Y=10X
>>>>Y/X=5/4
>>>>Y=5/4X=1.25X

stucash · 发表于 2010-4-15 20:07:30

你和kathy1987的名字我老分不出来....

pp2-ps-43 (求救~~~百分比)

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