3 men and 4 boys can earn Rs 756 in 7...

3 men and 4 boys can earn Rs 756 in 7 days. 11 men and 13 boys can earn Rs 3008 in 8 days. In what time will 7 men with 9 boys earn Rs 2480? (a) 8 days (b) 9 days (c) 10 days (d) 11 days

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