A can finish work in 9 days and b can do same work in 7 1/2 days b worked for 5 days and left the job in how many days a alonr can do the work
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B can do 1/7.5 part of work in one day
so in 5 days1/7.5*5=2/3
Work left over is 1/3 (1-2/3)
A alone can do the work in 9 days
1/9 part work done by A in one day
so 1/3 work done left by B will be done by A in 1/3*9= 3 days
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