Your Answer is

Correct Answer is K

Explanation

It can be seen from the figure that the supplementary angle of 150\degree is 30°, that is to say, the sum of the two interior angles of the triangle is 30°+40°=70°, and the other interior angle is 180°-70°=110°. 110° interior angle is complementary to x°, then 110°+x°=180°. x=70°