$\sqrt{225 \times 4}$ equals

$\sqrt{225 \times 4}$ equals
  1. $30$
  2. $60$
  3. $35$
  4. $25$

Solution

$\sqrt{225 \times 4} = \sqrt{225} \times \sqrt{4} = 15 \times 2 = 30$.

Asked in: IMO

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