Question

In a triangle ABC, Angle B is 3 times Angle A. Angle C is 5 degrees less than 6 times Angle A. Find the size of the angles.

Answer 1

B = 3A
C = 6A
A + B+C = 180.
You now have enough equations to find all the angles.

Answer 2

Can you take it from there?

Answer 3

That second equation should be B = 6A - 5.

Answer 4

The whole system is as follows:
B = 3A
C = 6A - 5
A + B + C = 180.

Answer 5

Substitute 3A for B and 6A - 5 for C into the last equatiom You will then have an equation in one unknown. You should get A = 18.5 degrees. Use that to get the values for B and C. B should be 92.5 degrees and C should be 111 degrees.