PREP 一道DS 题

112.
            11176-!-item-!-187;#058&007606

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.

方程解出来是这样

(x - 0.75)(n + 100) = xn

(x + 1.5)(n -100) = xn

两个方程加一起是不是也得不了答案啊

谢谢