SSC Delhi Forest Guard 2020 Mock Test Quantitative Aptitude Time and Work Work Efficiency

A alone can do a piece of work in 7 days and B alone in 9 days. A and B agreed to do it for Rs. 8400. With the help of C they completed the work in 3 days. How much is to be paid to C?

1
Rs. 1700
2
Rs. 2000
3
Rs. 4000
4
Rs. 6000
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