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Updated on: 09 Feb 2012, 13:58
Originally posted by timmaxwell8 on 12 Oct 2009, 12:42.
Last edited by Bunuel on 09 Feb 2012, 13:58, edited 1 time in total.
Last edited by Bunuel on 09 Feb 2012, 13:58, edited 1 time in total.
Edited the question and added the OA
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
82% (01:54) correct
18%
(02:29)
wrong
based on 448
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Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?
A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 18 minutes
E. 20 minutes
A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 18 minutes
E. 20 minutes
12 Oct 2009, 21:13
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You may set up common equation like this:
job/A+job/B+job/C=job/x
Memorize this universal formula, you will need it definitely for GMAT.
and find x from this equation
In this specific case, the equation will look like this:
20/40+20/30+20/24=20/x
If you solve this equation, you get the same answer D (10)
If you like my post, please give me kudos.
job/A+job/B+job/C=job/x
Memorize this universal formula, you will need it definitely for GMAT.
and find x from this equation
In this specific case, the equation will look like this:
20/40+20/30+20/24=20/x
If you solve this equation, you get the same answer D (10)
If you like my post, please give me kudos.
General Discussion
12 Oct 2009, 13:00
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timmaxwell8
J=20/40=1/2per min
S=20/30=2/3per min
JK=20/24=5/6per min
In one min together 1/2+2/3+5/6=12/6=2 pages.
For 20 pages=20/2=10
B.
