Question

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

Answer 1

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