Question

4 men can do a job in 30hrs. how many men would be needed to to the job in 6hrs.​

Answer 1

m = 6 h
4 m = 30 h
Cross multiplying, we get:
(M)(30) = (6)(4)
30m = 24
m = 24/30
m = 0.8 or 1 round off

Answer 2

4man = 30hrs

1man = 30/4

1man = 7.5hrs

4man = 30hrs

5man = 30-7.5 = 22.5

6man = 22.5-7.5 = 15

7man = 15-7.5 = 7.5

If 7 man did the job,they would need 7.5 hours or 7 hours and 30 mins.