Q11:

Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary’s campaign. If no one donated more than once and if there were no other donations, what was the value of n?

(1) The first n people donated 1/16 of the total amount donated.

(2) The total amount donated was $120,000.

为什么答案是both 都sufficient

在讨论帖中,大家给的答案都是500n+500^2

我觉得是500n是第一批denote的款, 由于n个人又劝服了n more个人,所以第二批是(n+n)500, 为什么大家的答案都是n的平方,我认为是2n呢,是不是我对highlight的话理解有误啊

第二批应该是N^2

可能是你理解的问题

我第一次也理解错了：）

所以应该是500n/500n+500n^2=1/16

500n+500n^2=120000