Question

Find the number which when multiplied by 7 is increased by 78.

Answer 1

Let the required number be x.
Given that, when multiplied by 7, it gives 7x, and x increases by 78.
According to the question we can write as 7x = x + 78
$\Rightarrow 7x–x=78$
$\Rightarrow 6x=78$
Dividing both sides by 6
$\Rightarrow \frac{6x}{6}=\frac{78}{6}$
$\Rightarrow x=13$
Thus, the required number is x = 13.