a can do a work in 15 days B can do it in 20 days in how many days both together can do the work
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A can do a work in 15 days .
Work of A in One day is 1/15 part.
B can do a work in 20 days .
work of B in one day is 1/20 part
so 'Togther work
1/15+1/20 = 7/60
so one day work is 60/7.Ans
Work of A in One day is 1/15 part.
B can do a work in 20 days .
work of B in one day is 1/20 part
so 'Togther work
1/15+1/20 = 7/60
so one day work is 60/7.Ans
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Let work of B is x day.Work of a is 3x so x+3x= 60 ' 4x =60 so 15 so work of B
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