Answer: x = 30
Explanation:
Since the triangles are similar, line EF corresponds to line JK
EF is 2.5 times bigger than JK
So the sides in the first triangle are 2.5 times bigger than the second triangle
Line FG corresponds to line KL so line FG / the value of X is 30 (12 * 2.5)
Write equation-

Divide-

Multiply by 12-

Answer-

so x = 30