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so let's write down three equations

1. B = 3A

2. C = 6A - 2

so there's one equation that's true for all triangles

3. A+B+C = 180 (the sum of all angles in a triangle is always 180 degrees)

now what you need to do is substitute until you get an equation with all one variable

how about let's try and get all A's

so we know B=3A, and C=6A - 2

so let's substitute both of those into the third equation - A+B+C = 180

so A + (3A) + (6A-2) = 180

10A - 2 = 180

10A = 182

A = 18.2

now that you have the value of A, you need to substitute it back into other equations to get B and C

if you do that, you'll have the answer