Plug in a rate for EACH WORKER.
1. If 36 men can do a piece of work in 25 days, in how many days will 15 men do it?
Let the rate per man = 1 unit per day.
Rate for 36 men = 36 units per pay.
In 25 days, the number of units produced by 36 men = 36*25 units.
Rate for 15 men = 15 units per day.
Time for these 15 men to produce the same number of units = (36*25)/15 = 60 days.
2. If 20 men can build a wall 112m long in 6 days, what length of a similar wall can be built by 25 men in 3 days?
Let the rate per man = 1 unit per day.
Rate for 20 men = 20 units per day.
Number of units produced by 20 men in 6 days = 20*6 = 120.
Rate for 25 men = 25 units per day.
Number of units produced by 25 men in 3 days = 75.
To determine the number of METERS produced by the 25 men, set up the following proportion:
(Work for 25 men)/(work for 20 men) = (x meters)/(112 meters)
75/120 = x/112
x = 70.
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