再求救一道数学题

新月

A1,Lew,and Karen pooled their funds to buy a gift for a friend.A1 contributed $2 less than 1/3 of the cost of the gift and Lew contributed $2 more than 1/4 of the cost.If Karen contributed the remaining $15,what was the cost of the gift?

$2 less than 1/3 of the cost of the gift

$2 more than 1/4 of the cost

这两句话怎么翻译?

robert

$2 less than 1/3 of the cost of the gift

比成本的1/3少2块

$2 more than 1/4 of the cost

比成本的1/4多2块

假设cost为x，则

(1/3x-2)+(1/4x+2)+15=x

5/12x=15

x=36

trifling

就是A1 分摊的钱比gift的cost的1/3 还少 $2，也就是A1分摊的钱=1/3*cost-2 

Lew 分摊的钱比gift的cost的1/4还多 $2, 也就是Lew分摊的钱=1/4*cost+2

新月

明白,谢谢了!