Question

Solve for $x$: $4x=36$

Answer 1

• Method 1:

$4x=36$
Here $4x$ represents $x+x+x+x$.

$36$ can be divided into four parts as
$36=18+18$
$\Rightarrow 36=(9+9)+(9+9)$

$\therefore$ Substituting these in the equation we get,
$x+x+x+x=9+9+9+9$
$\Rightarrow x=9$

• Method 2:

We know that division is the opposite of multiplication.

To obtain $x$ in the left hand side, we divide the equation by 4.
$4x=36$
$\Rightarrow \frac{4x}{4}=\frac{36}{4}$
$\Rightarrow x=9$