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DS - donation

Expert replies
by Xbond » Fri Sep 11, 2009 11:03 am
Hi there,

Could you give me your ELEGANT, QUICK, and EFFICIENT method to resolve (with these concepts and with finding the solution).


A certain group of car dealerships agreed to donate x dollars to a Red Cross chapter for each car sold
during a 30-day period. What was the total amount that was expected to be donated?

1) A total of 500 cars were expected to be sold.
2) 60 more cars were sold than expected, so that the total amount actually donated was $28,000
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Source: — Data Sufficiency |

Re: DS - donation

by dtweah » Sat Sep 12, 2009 1:53 am
Xbond wrote:Hi there,

Could you give me your ELEGANT, QUICK, and EFFICIENT method to resolve (with these concepts and with finding the solution).


A certain group of car dealerships agreed to donate x dollars to a Red Cross chapter for each car sold
during a 30-day period. What was the total amount that was expected to be donated?

1) A total of 500 cars were expected to be sold.
2) 60 more cars were sold than expected, so that the total amount actually donated was $28,000

Expected Donation= ($X/Car)(Total Number of Cars Expected to be Sold). So we need both X and number of cars sold to answer this question.

1) gives us only expected number of cars: 500x So not sufficient.

2) says that x(y+60)=28000, where y is cars expected to be sold. No suff

Combining, xy +60x=2800. Note xy= 500x in 1, and you can solve for x, don't need or have to.

Choose C.
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by Xbond » Mon Sep 14, 2009 12:52 am
many thks

OA is C
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