PP-T2-DS69

[smilego]

At the bakery, Lew spent a total of $6.00 for one kind of cupcake and one kind of doughnut. How many doughnuts did he buy?

(1) The price of 2 doughnuts was $0.10 less than the price of 3 cupcakes.

(2) The average (arithmetic mean) price of 1 doughnut and 1 cupcake was $0.35.

答案是 (E)

這題我選(A),想不出來為何是(E)
請教一下思路,謝謝!!

[amyliang]

One kind of cupcake and one kind of doughnut(花在一種cupcake和一種doughnut上)
total 6 元
(1) 2d=3c-o.1 不充份 不知道多少個
(2) d+c=0.7 還是不知道到底買了幾個

所以e