PP-T2-DS168

[Huang Hsin-Yi]

168. 16781-!-item-!-187;#058&011242
In a certain senior class, 72 percent of the male students and 80 percent of the female students have applied to college. What fraction of the students in the senior class are male?

(1) There are 840 students in the senior class.

(2) 75 percent of the students in the senior class have applied to college.

Ans:B

[sunnyblue13s]

它求fraction...所以只要(2)....
你的算法是對的....我剛剛看題目看太快了....

解釋的時候~~有點錯誤~~

解題關鍵...比例問題 - 幾乎不需要(1)數量的補充

[Huang Hsin-Yi]

仔細再看一下題
已知 0.72m+0.8f have applied to collage
題目問m/f+m
(1) m+f=840...........................................insufficient

(2)0.75(m+f) have applied to collage
-->0.72m+0.8f =0.75(m+f)
0.05f=0.03m 5f=3m
代入題目,可求fraction...............................sufficient

你想,我這樣算對不對,和你算的答案不同耶!