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Question

$$9$$ added to twice a number gives $$13$$. Find the number.


Solution

Let $$x$$ be the number 
Therefore, two times of the number is $$2x$$
On adding of $$9$$ we get $$2x+9$$
$$2x+9=13$$
$$\Rightarrow \ 2x=13-9=4$$ 
$$\Rightarrow \ x=\dfrac 42$$
$$\Rightarrow \ x=2$$
Therefore, the required number is $$2$$.

Maths

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