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

Redeem

Maths

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Master | Next Rank: 500 Posts
Posts: 232
Joined: Fri Jun 18, 2010 7:09 am
Thanked: 1 times
Followed by:2 members

Maths

by ruplun » Wed Jul 14, 2010 12:29 am
A number of light bulbs were purchased to illuminate a gym. However, only 2/3 of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or $96, was reimbursed. How much money was spent on illuminating the gym?


(A) 360
(B) 320
(C) 384
(D) 364
(E) 160


What will be the solution..please advice?
Top
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 am
Thanked: 135 times
Followed by:7 members

by selango » Wed Jul 14, 2010 1:05 am
Number of light bulbs=n

2/3 of n is needed

1/3*n=160

n=480

2/3*480=320 bulbs are needed

Let x be the cost of 160 bulbs.

Now 60/100*x=96

x=160

40/100*160=64

160 bulbs cost 160.

1 bulb cost 1.

320(1)+64=384 or 480-96=384

Option C
--Anand--
Top
Post new topic Post Reply
• Page 1 of 1