GMATBusters wrote:
A and B undertake to do a piece of work for Rs. 480. A alone can do it in 75 days while B alone can do it in 40 days. With the help of C, they finish the work in 25 days. How much Rs should C get for his work?
A. 20
B. 40
C. 60
D. 80
E.120
Let work = Multiple of (75 and 70) = 300 units
A does 600 unit work in 75 days i.e. work done per day = 8 units
A does 600 unit work in 40 days i.e. work done per day = 15 units
A and B work together then work done in one day = 8+15 = 23 units
A, B and C
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