work efficiency

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gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members; Thanked: 173 times; GMAT Score:710

by gmatmachoman » Thu Apr 29, 2010 4:14 am

12 persons can do a work in 10 days working 8 hours a day. How many days will be required by 10 persons, who will work 6
hours a day. The efficiency of each of these 10 persons is twice that of the earlier persons.

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Source: Beat The GMAT — Problem Solving | Thu Apr 29, 2010 4:14 am

liferocks: Legendary Member; Posts: 576; Joined: Sat Mar 13, 2010 8:31 pmFollowed by: 1 member; Thanked: 97 times

by liferocks » Thu Apr 29, 2010 4:27 am

total amount of work 12*8*10=960 man-hours

10 person complete 10*6*2 or 120 man-hour work in one day
hence they will need 960/120 or 8 days to complete the work

Ans 8 days

"If you don't know where you are going, any road will get you there."
Lewis Carroll

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