In triangle ABC, angle A is 87 degrees and angle B is 3 times less. Find angle C of triangle ABC.

To begin with, according to the available data in the problem statement, we calculate the angle B. Solution: 1) 87: 3 = 29 degrees. 2) add the values of the two known angles A and B 87 + 29 = 116 degrees. Since the sum of the angles of any triangle is 180 degrees, given the values of two angles, we can calculate the third angle: 3) 180-116 = 64 degrees.
Answer: angle C = 64 degrees.