If $x$ and $y$ are in direct proportion with $\dfrac{x}{y} = \dfrac{1}{4}$, and $x = 7$, find $y$.

If $x$ and $y$ are in direct proportion with $\dfrac{x}{y} = \dfrac{1}{4}$, and $x = 7$, find $y$.
  1. $24$
  2. $28$
  3. $30$
  4. $35$

Solution

$\dfrac{x}{y} = \dfrac{1}{4} \Rightarrow y = 4x = 4 \cdot 7 = 28$.

Asked in: IMO

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