Question

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Answer 1

Answer:

4 men and 4 boys can do a piece of work in 3 days while 2 men and 5 boys can finish it in 4 days.

:

Find the relationship between a man-day and a boy day

12 man-days + 12 boy-days = 8 man-days + 20 boy days

12 md - 8 md = 20bd - 12 bd

4md = 8bd

 

divide both sides by 4d

m = 2b (1 man = 2 boys)

:

Find how many man-days required to do the job, replace 2 b with 1 m

3(4 m + 2m) = 18 man days to do the job or 36 boy days to do the job

:

How long would it take 1 boy to do it? 36 days

How long would it take 1 man to do it? 18 days

Step-by-step explanation:

Answer 2

Please reply if it is right.