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Work_Groups

by gmatmachoman » Sun May 30, 2010 10:07 am
A takes 4 days to do a work. B takes twice as long as A. C takes twice as long as B and D takes twice as long as C. They are made in groups of two. One of the groups takes two third of the time taken by second pair. What is the combination of the first pair?

1) A,C 2) A,D 3) B,C 4) B,D
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by thephoenix » Sun May 30, 2010 10:12 am
a=4 days
b=8;c=16 and d=32
a+d takes 32*4/36=32/9 days
b+c takes 16*8/24=16/3 days
a
hence ad takes 2/3 of bc
ans is ad
i.e B
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by gmatmachoman » Sun May 30, 2010 10:21 am
thephoenix wrote:a=4 days
b=8;c=16 and d=32
a+d takes 32*4/36=32/9 days
b+c takes 16*8/24=16/3 days
a
hence ad takes 2/3 of bc
ans is ad
i.e B
Good work Pheonix bhai!
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