If 15 men are needed to finnish a job in 60 days, how many days will 40 men take to finish the same job

Question

Valentina · Answer

Answer:   15 men x 60 days = 900 work units    The increase in the amount of to 45 men should take 3 times less days, we shall work it out and see.    Work unit = 900 ÷ 45 men = 20 days    Note ,The amount men has increased from 15 to 45 men, 1:3 ratio    And the number of days has reduced from 60 days to 20 days, 3:1 ratio    What does not change is the amount of 900 work units

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Solve by method of undetermined coefficients

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