If 15 men can finish a job in 6 days in how many days can 18 men finish their job
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18 men can do the work in 7.2 days
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15m-6d
18-? X
Unitary method
More men less days
Less men more days
So it is indirect proportion
Therefore exchange 6d and x
So 15m-x
18-6d
Therefore 15:18::x:6
Product of means = product of extremes
18 X x=15 X 6
15 X6/18 =5
There fore 18 men can do it in 5 days
Hope this was helpful
18-? X
Unitary method
More men less days
Less men more days
So it is indirect proportion
Therefore exchange 6d and x
So 15m-x
18-6d
Therefore 15:18::x:6
Product of means = product of extremes
18 X x=15 X 6
15 X6/18 =5
There fore 18 men can do it in 5 days
Hope this was helpful
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