70 men can complete a 150m long wall in 12 days.How many men will complete the wall 600m long in 30 days ?

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150 m `-:` 12 days = 12.5 m/day

12.5 m/day `-:` 70 men = 5/28 m per man per day

So one man can be expected to complete 5/28 m in one day.

 

600 m `-:` 30 days = 20 m/day

So in order to build the 600 m wall in 30 days, the men need to build 20 m/day. 

Use the equation:

5/28 * x = 20, where x is the number of men

x = 20 `-:` 5/28

x = 112

Answer:  112 men

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