$x$ and $y$ are inversely proportional. If $x_1 : x_2 = 3 : 5$, then $y_1 : y_2$ equals:

$x$ and $y$ are inversely proportional. If $x_1 : x_2 = 3 : 5$, then $y_1 : y_2$ equals:
  1. $3 : 5$
  2. $5 : 3$
  3. $9 : 25$
  4. $25 : 9$

Solution

$x_1 y_1 = x_2 y_2 \Rightarrow \dfrac{y_1}{y_2} = \dfrac{x_2}{x_1} = \dfrac{5}{3}$.

Asked in: IMO

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