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1. A number when multiplied by 13 is increased by 180. The number is :

A. 5

B. 12

C. 15

D. 45

Solution:

Let the number be x
Then,

\begin{aligned} \Rightarrow 13 x = x + 180 \\ \Rightarrow 12 x = 180 \\ \Rightarrow x = \frac{180}{12} \\ \Rightarrow x = 15 \end{aligned}

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