求助戰友們!!!!!!!!!!!!!!急!!!!!!!!!!!!!!

hijenny

162.16257-!-item-!-187;#058&010730

What fraction of this year's graduating students at a certain college are males?



(1)Of this year's graduating students, 33 percent of the males and 20 percent of the females transferred from another college.



(2)Of this year's graduating students, 25 percent transferred from another college.

--------------------------------------------------------------------------------------------------------------------------------------------------------【答案】C




我的絲路是她是問全部畢業的學生而選項只給轉學生
明明是不一ˋ樣的資料阿
難道我會錯意了嗎???
懇請賜教


【思路】(1) 0.33M+0.2F=transfer
不充份
(2) 0.25（M+F)=transfer 不充份



(1)+ (2) M=5/8F充份

karenmax

但是1+2不就可以求出F M的比例了么？
此题只要求比例 不需要总数哦

fullmoon558

LS说的对哦，LZ你从条件一列出的等式里不是暗含着一个条件：M+F=1。这样的话就能从0.33M+0.2F=0.25里求出M了，M代表毕业生中男性的比例