A bag contains red, blue and green balls in the ratio $2 : 3 : 5$. What percent of the balls are blue?

A bag contains red, blue and green balls in the ratio $2 : 3 : 5$. What percent of the balls are blue?
  1. $20\%$
  2. $30\%$
  3. $33\dfrac{1}{3}\%$
  4. $50\%$

Solution

Total parts $= 2 + 3 + 5 = 10$. Blue fraction $= \dfrac{3}{10} = 30\%$.

Asked in: IMO

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