OG(11th)PS-Q220

[oguz]

John and Mary were each paid x dollars in advance to do a certain job together. John worked on the job for 10 hours and Mary worked 2 hours less than John. If Mary gave John y dollars of her payment so that they would have received the same hourly wage, what was the dollar amount, in terms of y, that John was paid in advance?
(A) 4y
(B) 5y
(C) 6y
(D) 8y
(E) 9y

這一題該如何做? 實在看不懂OG的解釋

[micki]

我的想法是:

John: original hourly wage = X/10
Mary: original hourly wage = X/(10-2) = X/8

Mary 給John Y元之後,兩人 hourly wage 會相等
John: newl hourly wage = (X+Y)/10
||
Mary: new hourly wage = (X-Y)/8

X=9Y

所以我選 E , 請問答案對嗎???

[oguz]

sorry
一時疏忽忘了把答案給寫上去
答案是 (E) 沒錯
謝謝你的解釋
真的很清楚 一看就懂