Question:
In the given figure, AOB is a straight line. The value of x is
(a) 12
(b) 15
(c) 20
(d) 25
Solution:
It is given that, AOB is a straight line.
∴ 60º + (5xº + 3xº) = 180º (Linear pair)
⇒ 8xº = 180º − 60º = 120º
⇒ xº = 15º
Thus, the value of x is 15.
Hence, the correct answer is option (b).