In an isosceles triangle two angles are equal. The measure of angle A is 20 degrees more than three times angle B. Angle B has the same measure as angle C.

The sum of the three angles is 180 degrees. If the measure of angle C is X.

X + X + 3*X + 20 = 180

=> 5X = 160

=> X = 32

**The measure of angle C is 32 degrees.**

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