In a pie chart, the angle for category $A$ is $72^{\circ}$. If $A$ corresponds to $20$ units, total units are:

In a pie chart, the angle for category $A$ is $72^{\circ}$. If $A$ corresponds to $20$ units, total units are:
  1. $60$
  2. $80$
  3. $100$
  4. $120$

Solution

Total $= 20\times \dfrac{360}{72} = 20\times 5 = 100$.

Asked in: IMO

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