Quant Question Of The Day: 245
A, B, C, and D can do a piece of work in 2 days. A and B together can do it in 6 days and C alone can do it in 9 days, in how many days can D alone do it
A, B, C, and D can do a piece of work in 2 days. A and B together can do it in 6 days and C alone can do it in 9 days, in how many days can D alone do it
Solution Say work = 18 units Rate of a+b+c+d = 18/2 = 9 units/day rate of a=b = 18/6 = 3 units/day rate of c = 18/9 = 2 units/ day hence rate of d = 9-(3+2) =4 units/ day so time take by d = 18/4 = 4.5 days
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