Question
Find the missing quantity if $x$ varies directly as $y$.
| x | 12 | 6 |
| y | 48 | - |
✓
Answer
Here, $x$ varies directly as $y$,
$\begin{array}{l}\Rightarrow \quad \frac{12}{48}=\frac{6}{a} \Rightarrow 12 a=6 \times 48 \\ \Rightarrow \quad a=\frac{6 \times 48}{12} \Rightarrow a=24\end{array}$
| x | 12 | 6 |
| y | 48 | - |
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