The measure of angle a is 45 degrees. the measure of angle b is b degrees. the measure of angle c is 3b degrees

Since there are only three angels I guess this is a triangle
180 = 45 + b + 3b
180 = 45 + 4b
180-45 = 45 -45 +4b
135 = 4b
135/4 = 4b/4
b = 33.75

angle b = 33.75
angle c = 101.25

Check
40 + 33.75 +101.25 = 180
180 = 180

Think of it as five or above give it a shove. change the 5 or above to the right to a zero and add one to the number on the left.