BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

DS - donation

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 275
Joined: Wed Jul 02, 2008 4:19 am
Thanked: 4 times

DS - donation

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
Top
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 487
Joined: Fri Mar 27, 2009 5:49 am
Thanked: 36 times

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.
Top
Master | Next Rank: 500 Posts
Posts: 275
Joined: Wed Jul 02, 2008 4:19 am
Thanked: 4 times

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

OA is C
Top
Post new topic Post Reply
• Page 1 of 1