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If $\frac{20}{3} = \frac{120}{y}$ then $y$ equals

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A 9 B 12 C 15 D 18 E 20

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Official solution

If the numerator has been multiplied by $6$ and the fraction stays the same, the denominator is also multiplied by $6$ and becomes $3 \times 6 = 18$.

Source: MathNet, licensed CC-BY-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.