Question

19 men working 7 1/2 hours a day can finish a job in 21 days. How many hours a day must 45 men work to complete it in 7 days?

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Answer 1

Answer:

19 men take 21 days working 15/2 hours per day.

Hours per day 45 men will take to complete in 7 days will be:

if 19 men = 15/2 hours

then 45 men =  19/45 hours ( this because the 45 men will take less                                                        hours per day, hence you use the lesser fraction of the two values)



if 21 days =  15/2 hours per day

then 7 days= 21/7    (this because the hours required will be more, hence you use the                                        larger fraction of the two values)

therefore the calculation is =  15/2 x 19/45 x 21/7

                                   = (15x19x21)/(2x45x7)

                                 

                                   = 19/2

                                    = 9.5 hours per day

Answer 2

Answer:

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