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A box contains 10 balls, some are red and some are black. Each of the following could be the ratio of the red to black balls EXCEPT ---

A box contains 10 balls, some are red and some are black. Each of the following could be the ratio of the red to black balls EXCEPT --- Correct Answer 5:1

The number of balls(10) must be divisible by the sum of the ratios. But, 10 is not divisible by the sum of the ratios 5:1 which is (5 + 1 = 6). So, the ratio of the balls cannot be 5:1.

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