Question

$9x +x = 100$
$x + x = 10$
$x + x + x = 18$
$x + 3x = 48$
​

Answer 1

$9x + x = 100$

$10x = 100$

$x = \frac{100}{10}$

$x = 10$

.

.

$x+x=10$

$2x= 10$

$x= \frac{10}{2}$

$x=5$

.

.

$x+x+x=18$

$3x=18$

$x= \frac{18}{3}$

$x=6$

.

.

$x+3x=48$

$4x=48$

$x= \frac{48}{4}$

$x=12$