A cylindrical drum has radius $35$ cm and height $1$ m. Its capacity in litres is (use $\pi=\dfrac{22}{7}$):

A cylindrical drum has radius $35$ cm and height $1$ m. Its capacity in litres is (use $\pi=\dfrac{22}{7}$):
  1. $385$ L
  2. $192.5$ L
  3. $770$ L
  4. $110$ L

Solution

$r = 35$ cm, $h = 100$ cm. $V = \dfrac{22}{7} \times 35^{2} \times 100 = \dfrac{22}{7} \times 1225 \times 100 = 22 \times 175 \times 100 = 385000 \text{ cm}^{3} = 385$ L.

Asked in: IMO

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