Question
A and B can do a piece of work in 5 days, while C and D
can do the same work in 20 days. In how many days will A, B, C and D do it together?Solution
Let the total work be LCM of 5 and 20 = 20 units. Work done by A+B in 1 day = 1 unit Work done by C+D in 1 day = 4 unit Work done by A+B+C+D in 1 days = 4+1 =5 unit Fraction of work left = (20)/5 =4days.
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