Discussion

1) A and b can complete the work in 20 and 36 days respectively. a works for the first 5 days and then quits. how many days b has to work to complete the work ?

Explanation:

A 's 1 day work = 1/20 A's 5 day work = 5/20 = 1/4
B has to do the remaining 3/4 of the work B will take 36 x (3/4) days = 27 days

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