問一題PP數學，大大幫忙囉

Each person attending a fund-raising party for a certain club was charged the same admission fee.  How many people attended the party?

(1) If the admission fee had been $0.75 less and 100 more people had attended, the club would have received the same amount in admission fees.

(2) If the admission fee had been $1.50 more and 100 fewer people had attended, the club would have received the same amount in admission fees.

答案C

我看不懂題意耶

感謝

题意是说参加某个晚会的每个人都被收取了相同的入场费，问你有多少人参加了晚会？

1）如果入场费减少0.75美元，并且又有100人参加，那么总入场费数量不变。

2）如果入场费增加1.50美元，并且少了100人参加，那么总入场费数量不变。

只要设出入场费和人数，解方程组即可。

一开始也做错了 乍一看(x-0.75)(y+100)=xy=(x+1.5)(y-100) 是解不出来 其实到最后 xy x都消掉了

哇，原來如此

好神

感謝大大幫忙解或