Same survey of $720$ students with sectors Maths $150^\circ$, Science $120^\circ$, English $60^\circ$, Hindi…

Same survey of $720$ students with sectors Maths $150^\circ$, Science $120^\circ$, English $60^\circ$, Hindi $30^\circ$. The number who chose Science is:
  1. $120$
  2. $200$
  3. $240$
  4. $280$

Solution

Number $= (120/360)\times 720 = (1/3)\times 720 = 240$.

Asked in: IMO

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