Question

If a carton, containing a dozen mirrors is dropped, then which of the following cannot be the ratio of broken mirrors to unbroken mirrors?

Options

• 2 : 1

• 7 : 5

• 3 : 2

• 3 : 1

Answer 1

3 : 2

Explanation:

For a ratio of 3 : 2, the total number of mirrors must be a multiple of 5. Twelve is not a multiple of 5, so this ratio is impossible; the other ratios can give whole-number counts totaling 12.