Question

given $l \parallel m \parallel n$, find the value of $x$.

Explanation:

Step1: Find supplementary angle of 124°

The angle adjacent to $124^\circ$ on line $n$ is supplementary, so calculate:
$180^\circ - 124^\circ = 56^\circ$

Step2: Use parallel lines property

Since $l \parallel m \parallel n$, corresponding angles are equal. The $56^\circ$ angle corresponds to $x^\circ$, so:
$x = 56$

Answer:

$56$