Mean of $\dfrac{2}{3}$ and $\dfrac{4}{5}$ is

Mean of $\dfrac{2}{3}$ and $\dfrac{4}{5}$ is
  1. $\dfrac{11}{15}$
  2. $\dfrac{6}{8}$
  3. $\dfrac{8}{15}$
  4. $\dfrac{2}{4}$

Solution

$\dfrac{1}{2}\left(\dfrac{10+12}{15}\right) = \dfrac{11}{15}$.

Asked in: IMO

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