Time and work

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tass@: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Sat Jun 07, 2014 3:12 am; Thanked: 2 times

by tass@ » Sat Jun 07, 2014 3:17 am

2 men and 5 women can do 1/4 of the work in 3 days. After 3 days 1 man joined to the group and completed another 1/4 of the work in 2 days. How many men need to do the work in 4 days.

a) 6 b) 12 c) 24 d) 16

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Source: Beat The GMAT — Problem Solving | Sat Jun 07, 2014 3:17 am

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by [email protected] » Mon Jun 09, 2014 12:06 pm

Hi tass@,

This is a poorly worded prompt.

It is unclear if each man and each woman does the same amount of work per day. It's also unclear if the "2 mean and 5 women" are EACH doing 1/4 of the work in 3 days or if the GROUP is doing 1/4 of the work in 3 days. The question itself is unclear as well - is it asking how many men we need or how many ADDITIONAL men we need.

While the GMAT will test the concepts of "work" and "rates", this question is not a valid example of how the GMAT will present either idea.

GMAT assassins aren't born, they're made,
Rich

Contact Rich at [email protected]

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Mon Jun 09, 2014 8:57 pm

Hi tass@,

Definitely not a GMAT-calibre question.
Rather than study from whatever (non-GMAT-like) resource you got this question from, stick with official GMAT questions and questions from reputable companies. Otherwise, you won't be adequately prepared for test day.

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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