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(d) 180

Let $x$ be the required number. Then, we have :

$5 \%$ of $x=9$

$\Rightarrow\left(x \times \frac{5}{100}\right)=9$

$\Rightarrow \frac{5 x}{100}=9$

$\Rightarrow x=\left(9 \times \frac{100}{5}\right)$

$\Rightarrow x=180$