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Time and Work

30 men can fi...

Question

$30$ men can finish a piece of work in $28$ days.How many days will be taken by $21$ men to finish it?

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Solution

$< y = 80^{o}$
Total no of man in $28$ days $28 \times 30 = 840$ man day so to do work we need $40$ man day for $21$ man it will take $\frac{840}{21} = 40$ day

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