Greatest of $\dfrac{3}{4}, \dfrac{5}{6}, \dfrac{7}{8}$ is

Greatest of $\dfrac{3}{4}, \dfrac{5}{6}, \dfrac{7}{8}$ is
  1. $\dfrac{7}{8}$
  2. $\dfrac{5}{6}$
  3. $\dfrac{3}{4}$
  4. All equal

Solution

LCM 24: $18, 20, 21$. Largest $= \dfrac{7}{8}$.

Asked in: IMO

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