Question
A contractor hired 40 workers to complete a work in 100
days. After 70 days, it was found that only 2/5th of the work was completed. Find the number of extra workers needed to be hired, so that the work gets completed on time.Solution
ATQ, Let 'n' more workers joined after 70 days and let total work be 5W units. Using (men X days) ÷ work = constant 
Simplifying, 
Therefore, 100 extra workers are needed so that work gets completed on time.
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