Question

In the given figure, AOB is a straight line. The value of x is

(a) 12

(b) 15

(c) 20

(d) 25

Answer 1

ANSWER:
It is given that, AOB is a straight line.
∴${60}^{\circ }+(5^{\circ }x+3^{\circ }x)={180}^{\circ }$
(Linear pair)
⇒$8^{\circ }x={180}^{\circ }-{60}^{\circ }={120}^{\circ }$
⇒$x={15}^{\circ }$
Thus, the value of x is 15.
Hence, the correct answer is option (b).