Subject :IMO Class : Class 9
In the given figure, AOB is a straight line and ∠AOX3 = 57°, ∠X1OX4 = 97°, ∠X3OB = 123° and ∠X4OB = 68°. Find ∠AOX1.
(a) 40°
(b) 30°
(c) 25°
(d) 15°