A and B can do a piece of work in 9 days, B and
C can do it in 12 days and A and C can do it in 18
days. If A, B and C work together, then the work
would be finished in
(1) 6 days (2) 7 days
(3) 8 days (4) 4 days
rk860341:
(3)
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answer is in photo please see it
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(3)
a+b=1/;9
b+c=1/12
c+a=1/18
a+b+c=1/8
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