7) A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3,200. With the help of C, they completed the work in 3 days. How much is to be paid to C?
Answer is:
Rs. 400
ISRO Technical Assistant Mechanical Question Paper - 2019 (Set-2) with Answer Key
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Answer is: