If the ratio of red to blue balls is 3:4 and you have 21 red balls, how many blue balls are there?

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Multiple Choice

If the ratio of red to blue balls is 3:4 and you have 21 red balls, how many blue balls are there?

Explanation:
Ratios show how many parts of one thing correspond to parts of another. In a red-to-blue ratio of 3:4, red is 3 parts and blue is 4 parts. If the red count is 21, that fills the 3 parts, so one part equals 21 ÷ 3 = 7. The blue side has 4 parts, so 4 × 7 = 28 blue balls. Quick check: 21 and 28 simplify to 3:4, which matches the given ratio. There are 28 blue balls.

Ratios show how many parts of one thing correspond to parts of another. In a red-to-blue ratio of 3:4, red is 3 parts and blue is 4 parts. If the red count is 21, that fills the 3 parts, so one part equals 21 ÷ 3 = 7. The blue side has 4 parts, so 4 × 7 = 28 blue balls. Quick check: 21 and 28 simplify to 3:4, which matches the given ratio. There are 28 blue balls.

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