Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persua ded 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 of the total amount donated.
(2) The total amount donated was $120,000.
gmat pre question
This topic has expert replies
- pradeepkaushal9518
- Legendary Member
- Posts: 1309
- Joined: Wed Mar 17, 2010 11:41 pm
- Thanked: 33 times
- Followed by:5 members
-
- Legendary Member
- Posts: 1035
- Joined: Wed Aug 27, 2008 10:56 pm
- Thanked: 104 times
- Followed by:1 members
pradeepkaushal9518 wrote:Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persua ded 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 of the total amount donated.
(2) The total amount donated was $120,000.
typo in statement 1?
2) is sufficient.
500*n+500*n^2=120,000 (each of n persuaded n more people=>n^2)
can be solved for n