A is 50% as efficient as
b. C does half of the work done by a and b together in same time . If c alone does the work in 20 days ,then a,b,and c together can do work in solve this in easy method
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if a b c works together
work done by c= half
work done by b a= half
work by c in 1 day = 1/20 so
work by a b in 1 day=1/20 also
if they works together
work in 1 day = 1/20+1/20= 1/10
therefore work will end in 10 days
work done by c= half
work done by b a= half
work by c in 1 day = 1/20 so
work by a b in 1 day=1/20 also
if they works together
work in 1 day = 1/20+1/20= 1/10
therefore work will end in 10 days
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