The ratio A:B is 3:4. If A = 15, what is B?

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Multiple Choice

The ratio A:B is 3:4. If A = 15, what is B?

Explanation:
The ratio A:B = 3:4 means A and B are in the same 3 to 4 proportion. If A is 15, that represents 3 parts, so one part is 15 ÷ 3 = 5. B corresponds to 4 parts, so B = 4 × 5 = 20. This keeps the same 3:4 relationship, since 15:20 simplifies to 3:4. The other values would not maintain that ratio (for example, 15 would make A and B equal, 10 would give a 3:2 ratio, and 25 would give a 3:5 ratio).

The ratio A:B = 3:4 means A and B are in the same 3 to 4 proportion. If A is 15, that represents 3 parts, so one part is 15 ÷ 3 = 5. B corresponds to 4 parts, so B = 4 × 5 = 20. This keeps the same 3:4 relationship, since 15:20 simplifies to 3:4. The other values would not maintain that ratio (for example, 15 would make A and B equal, 10 would give a 3:2 ratio, and 25 would give a 3:5 ratio).

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