Question

Put the correct number in the box, so that the equation remains true.

If $\text{4x-10=30}$ then $4x-10+5=30\boxed{}$

Answer 1

Given, If $\text{4x-10=30}$ then $4x-10+5=30\boxed{}$

From given expression,

$$\begin{gathered} \text{⇒4x-10 = 30} \\ \Rightarrow 4x-10+5=\; 30+5[\mathrm{Add}5\mathrm{both}\mathrm{sides}] \end{gathered}$$

Comparing this expression with the given expression $4x-10+5=30\boxed{}$ we get $+5$ as the number to be placed in the box.

Hence, If $\text{4x-10=30}$ then $4x-10+5=30\boxed{+5}$.