The ratio of number a to number B is 3:5, and the ratio of number B to number C is 4:7. Then the ratio of number a to number C is (:)

Because the ratio of number a to number B is (3 × 4): (5 × 4) = 12:20, the ratio of number B to number C is (4 × 5): (7 × 5) = 20:35, so the ratio of number a to number C is: 12:35; so the answer is: 12,35

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