Question:
Tick (✓) the correct answer
If $\frac{n}{n+15}=\frac{4}{9}$, then $n=$ ?
(a) 4
(b) 6
(c) 9
(d) 12
Solution:
(d) 12
$\frac{n}{n+15}=\frac{4}{9}$
$\Rightarrow 9 n=4(n+15)$
$\Rightarrow 9 n=4 n+60$
$\Rightarrow 9 n-4 n=60$
$\Rightarrow 5 n=60$
$\Rightarrow n=\frac{60}{5}=12$
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