$\sqrt{\dfrac{144}{225}}$ equals

$\sqrt{\dfrac{144}{225}}$ equals
  1. $\dfrac{12}{15}$
  2. $\dfrac{15}{12}$
  3. $\dfrac{12}{225}$
  4. $\dfrac{144}{15}$

Solution

$\dfrac{\sqrt{144}}{\sqrt{225}} = \dfrac{12}{15}$ (which simplifies to $\dfrac{4}{5}$).

Asked in: IMO

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