1.

19 men working 15/2 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​

Answer»

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

hope..it..HELPS.....

mark,,,me..BRAINLIEST..


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