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Work done by A in 1 day =1/20

Work done by A in 5 days= 5/20 = 1/4

Work done by B= 1-1/4= 3/4

Work done by B in 1 day = 3/4 √∑ 10 = 3/40

Work done by both A and B in 1 day =

1/20 + 3/40 = 5/40 = 1/8

Total days taken by both A and B to complete the work = 1 √∑ (1/8) = 8 days

Ans: A) 8 days

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