Question

The degree measure of each of the three angles of a triangle is an integer. Which of the following cannot be the ratio of their measures?

A) 2:3:4
B)3:4:5
C)4:5:6
D)5:6:7
E)6:7:8

Answer 1

E)
because
6x+7x+8x =180
21x=180
x=180/21 which is not an integer
thus 6x = 6*(180/21) is not an integer