Question

18. If 3 men or 9 boys can finish a piece of work in 21
days, in how many days can 5 men and 6 boys
together do the same piece of work?
(a) 8 days
(b) 12 days
(c) 14 days
(d) Cannot be determined
(e) None of these​

Answer 1

Answer:

5 men and 6 boys together  can do work in 9 days .

Step-by-step explanation:

3 men = 9 boys

So, 1 man =  

5 men =  

So,  5 men and 6 boys together = 15+6= 21 boys

9 boys can finish a piece of work in 21 days.

1 boy can finish work in days =  

21 boys can finish work in days =  

21 boys can finish work in days =9 days

Hence 5 men and 6 boys together  can do work in 9 days .

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