Question

Fill in the blank

If a number is increased by $20$, it becomes $45$. Then the number is _____

Answer 1

Let a number is $x$

A number is increased by $20$ it becomes $45$

Then $x+20=45$

Transpose $\text{'}20\text{'}$on RHS

$$\begin{gathered} x=45-20 \\ \therefore x=25 \end{gathered}$$

Hence the number is $25.$