Question

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

Answer 1

Find the missing number

Let the required number be $x$

If the number is increased by $20$ $\Rightarrow x+20$

Given, $x+20=45$

Transpose $20$ to the RHS it becomes $-20$

$x=45-20$

$\therefore$ $x=25$

Hence, the number required is $25$.