A team of 50 employees is tasked with finishing a project in 25 days. After 15 days, it was discovered that only 15^th of the project was completed. How many additional employees need to be hired to ensure the project is completed on schedule?

A team of 50 employees is tasked with finishi… | GMAT Sprint

Free Practice Question

PS · Problem Solving

655-705

Work Rate Problems

A team of 50 employees is tasked with finishing a project in 25 days. After 15 days, it was discovered that only $\frac{1}{5}^{th}$ of the project was completed. How many additional employees need to be hired to ensure the project is completed on schedule?

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150

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Explanation

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If all the employees work at a constant rate and after 15 days, it was found that only

\frac{1}{5}^{th}

of the project was completed =>

\frac{1}{5}

of the project = 15*50 workerdays = 750 workerdays. The remaining work =

\frac{4}{5}

of the project = 4 *…

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What this question tests

Your ability to combine individual work rates, usually by working with the fraction of a job completed per unit of time.

Adding the times instead of the rates, or forgetting to take the reciprocal when combining rates.