gwd 4 20

Kath1985

Q20:
Of the students in a certain school, 15 percent are enrolled in an art class and 10 percent are enrolled in a music class.What percent of the students in the school are enrolled in neither an art class nor a music class?
(1)2/3 of the students who are enrolled in an art class are also enrolled in a music class.
(2)There are more than 100 students in the school.
是A
請問1.我的思維如下圖對不對呢?
請問2.答案A求出來是不是17/20呢
[attachimg=992,556]87404[/attachimg]

FIGHTING618

答案应该是85%。
你的方法是可以的。
但是有点麻烦。

Kath1985

感謝