If 5 men can
build a wall in 12 days, how many men can build it in 10 days
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Recall that:
Inverse proportion is the relationship between two variables such that the increase in one will cause a proportional decrease in the other.
- more men = fewer days needed
- fewer men = more days needed
Given:
5 men = 12 days
Find:
Number of men needed to build the wall in 10 days.
Find the man-day for the job:
Man-Days = number of men needed x number of days needed
Man-Days = 5 x 12
Man-Days = 60
Find the number of men needed to build the wall in 10 days:
Man-Day = 60
Days = 10
Number of men needed = 60 ÷ 10
Number of men needed = 6
Answer: 6 men area needed to build the wall in 10 days.
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