The ratio of a basketball player's completed free throws to attempted free throws is 4 to 7. If she completed 12 free throws, find how many free throws she attempted.

The ratio of completed to attempted free throws is 4:7. Since 12 completed free throws is 3 times 4, multiply the attempted amount, 7, by 3 as well: 7 × 3 = 21. She attempted 21 free throws, which is choice C.

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