If 3 men or 9 boys can finish a work in 21 days, then in how many days can 5 men and 6 boys finish the same work?

Question

If 3 men or 9 boys can finish a work in 21 days, then in how many days can 5 men and 6 boys finish the same work?

Options

A.

7

B.

9

C.

11

D.

13

cuet 2023work efficiencycombined workforcetime calculation

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