A, B and C, each of them working alone can complete a job in 6, 8 and 12 days respectively. If all three of them work together to complete a job and earn Rs.2340, what will be C's share of the earnings?

260

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520

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780

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130

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none

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Solution

The correct option is B
520

Let W be the total work So C's share will be $\frac{\frac{W}{12}}{\frac{W}{6} + \frac{W}{8} + \frac{W}{12}}$ *2340=520

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