Question 65

If 30 persons take 10 days to complete a certain work working 8 hours a day, then 40 persons should work how many hours a day so that the work is completed in 6 days?

Solution

by using this trick solve this type of problems

$$men_1\times days_1\times hours_1=men_2\times days_2\times hours_2$$

$$30\times10\times8=40\times6\times H_2$$

$$H_2=\frac{30\times10\times8}{40\times6}$$

$$H_2=10$$

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