In the figure, PQ is a parallel to ST and QRS = 40o. Find the value of x

In the figure, PQ is a parallel to ST and QRS = 40^o. Find the value of x

Correct Answer: Option A

Explanation:
From the figure, 3x + x - 40^o = 180^o
4x = 180^o + 40^o
4x = 220^o
x = \(\frac{220}{4}\)
= 55^o