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NIELIT 2016 MAR Scientist D: 71

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Let's call the unknown number $x$.

 $x+(50\%* x) = 27$

 $\implies x+0.5x =27$

 $\implies1.5x=27$

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

 $\implies x=18$

So option $(D)$ is correct.
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