Answer:
x = 4
Step-by-step explanation:
From the figure attached,
Two lines l and m are the parallel lines.
Angle BAD is an exterior angle of triangle ABC.
By the theorem of exterior angle of a triangle,
"Exterior angle of a triangle is equal to the sum of two opposite interior angles."
m(∠BAD) = m(∠ABC) + m(∠BCA)
28x = 16x + 48
28x - 16x = 48
12x = 48
x = 4
Therefore, x = 4 will be the answer.