Symbiosis National Aptitude Test SNAP 2018 Paper

Let Ramu has n friends
Number of friends went to Mumbai = $\frac{\mathit{n}}{5}$
Number of friends went to Delhi = $\frac{\mathit{n}}{3}$
Number of friends went to Chennai = $\left(\frac{\mathit{n}}{3}-\frac{\mathit{n}}{5}\right)\times 3$
= $\frac{2\mathit{n}}{5}$
Number of friends went to Pune = 1
ATQ,
$\mathit{n}-\frac{\mathit{n}}{5}-\frac{\mathit{n}}{3}-\frac{2\mathit{n}}{5}$ = 1
$\frac{\left(15-3-5-6\right)}{15}$
n = 1 ⇒ n = 15
∴ Number of friend went to mumbai = = $\frac{\mathit{n}}{5}$ = $\frac{15}{5}$ = 3