Discussion :: Chain Rule
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A contractor engaged 100 labors for completing a certain project within a fixed time. When
of the time limit had expired, he found that 
of the originally assigned work had been already completed. The number of laborers who could be removed by the contractor for this project so that the project could be completed by the remaining laborers within the given time limit would be
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Answer : Option A
Explanation :
Let the work be 4 units and the time be 5 days, this assumption is taken on the basis of the denominator part of the given fraction.
That means, 3 units of work are completed in 3 days and the 100 men working per day.
Therefore 1 unit of the work is done in 1 day by 100 men......... (i)
Now the remaining one unit of the work should be done in 2 days (5 days ? 3 days)
But by equation one, to complete 1 unit work, one day required by 100 men.
If we reduce the men working per day by 50%, then double time is required to finish the remaining work.
So, 50% reduction of men = 100/2 = 50 men
Therefore (100- 50) = 50 men must be removed.
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