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A certain number when added to $50\%$ of itself is $27$. What is the number?

1. $7$
2. $9$
3. $11$
4. $18$

Let's call the unknown number $x$.

$\text{x+(50%of x) = 27}$

$\implies \text{x+0.5x =27}$

$\implies\text{1.5x=27}$

$\implies x=\frac{27}{1.5}$

$\implies\text{x=18}$

So option $(D)$ is correct.
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