If 3 men or 9 boys can finish the a piece of work in 21 days .In how many days can 5 men and 6 boys can complete the same piece of work
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Answer: 9 days
Step-by-step explanation:
3 men = 9 boys
1 man = 3 boys
So, 5 men is = (3×5) boys = 15 boys
9 boys can complete in 21 days
1 boy can complete in = (21×9) days
5 men + 6 boys = (15 + 6) boys
= 21 boys can complete in = (21×9)÷21 days
= 9 days
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