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04 Apr 2017, 05:28
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
93% (00:51) correct
7%
(01:38)
wrong
based on 109
sessions
History
Date
Time
Result
Not Attempted Yet
Lois can complete a certain job in x hours and Parnel can complete the same job in y hours. Which of the following expresses, in terms of x and y, the time it would take them to complete the job if they worked together?
A. (x + y)/y
B. xy/y
C. xy/x
D. 2/(xy)
E. xy/(x + y)
A. (x + y)/y
B. xy/y
C. xy/x
D. 2/(xy)
E. xy/(x + y)
eddy8700
Joined: 25 Jan 2016
Last visit: 02 Oct 2020
Posts: 86
Own Kudos:
Given Kudos: 12
Status:active
Location: India
Concentration: Finance, Entrepreneurship
Schools: Rotman '19 Insead Sept'18 Booth '19
GPA: 4
WE:Web Development (Computer Software)
04 Apr 2017, 05:47
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Answer is E
1/x + 1/y=Combined rate
time taken would be xy/(x+y)
1/x + 1/y=Combined rate
time taken would be xy/(x+y)
IdiomSavant
Joined: 14 Sep 2016
Last visit: 03 May 2018
Posts: 45
Own Kudos:
Given Kudos: 119
Concentration: Finance, Economics
Schools: Boston U '20 Carroll '20
04 Apr 2017, 06:42
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Bunuel
E.
Pick numbers
Lois
Job in 10 hours
X=10
\(\frac{1}{10}\) job an hour
Parnel
Job in 5 hours
Y =5
\(\frac{1}{5}\) job an hour
Together
x + y = \(\frac{3}{10}\) job an hour
or 3.33 hours to do the job together.
Plug in x=10 and y=5 into the answer choices until you find 3.33 which is E.
