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Inverse Proportion

8 men can fin...

Question

8 men can finish a piece of work in 15 hours. In how many hours can 20 men finish it?

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Solution

Time taken to finish the work by 8 men = 15 h
Time taken to finish the work by 1 man = 8 $\times$ 15 h [Less men, more time taken]
∴ Time taken to finish the work by 20 men = $\frac{8 \times 15}{20}$ h = 6 h [More men, less time taken]

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