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If a/b = 3/5 and b/c = 7/13, find the ratio a: b: c.

1. 21: 35: 65
2. 15: 25: 39
3. 3: 5: 7
4. 13: 7: 5

Correct answer: 21: 35: 65

Solution

Express both ratios with the same value of b, then read off a: b: c.

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