A, B and C can do a work in 20, 25 and 30 days respectively. They undertook to finish the work together for Rs. 2220, then the share of A exceeds that of B by?

Rs. 120
Rs. 180
Rs. 300
Rs. 600

Correct Answer: Rs. 180

Explanation:

Ratio of shares of A, B and C = 1/20 : 1/25 : 1/30 = 15 : 12 : 10
∴ A's share = Rs.(2220 x 15/37) = Rs. 900
B's share = Rs.(2220 x 12/37) =Rs. 720
Thus, the share of A exceeds that of B by Rs.(900 - 720) = Rs. 180.

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