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

Redeem

GMATPrep Test 1 #2_PS Rates Basic #21

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Sun Mar 11, 2012 8:47 pm
kwah wrote:What is the most efficient way to achieve the result for question attached?

Answer: B

Thanks,

K
Let the rate of 1 machine = x
Then rate of 10 machines = 10x
It is given that work = 16 * 10x
Let time taken by 8 machines = T
Then same work = 8x * T
So, 16 * 10x = 8x * T implies T = 20 hrs

The correct answer is B.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Junior | Next Rank: 30 Posts
Posts: 26
Joined: Thu Dec 04, 2008 9:19 pm
Location: Bangalore
Thanked: 1 times

by dhiren8182 » Sun Mar 11, 2012 10:04 pm
I solved by formulae:
W1T1=W2T2
10*16=8*x
so x=20
therefore 20 hrs required to compelte job
Top
Post new topic Post Reply
• Page 1 of 1