Question
A contractor hired 80 workers to complete a work in 60
days. After 40 days, it was found that only half 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 40 days and let total work be 2W units. Using (men X days) ÷ work = constant 
Simplifying, 
Therefore, 80 extra workers are needed so that work gets completed on time.
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