What is the value of x? What is the measure of angle A?
What is the measure of angle B?
What is the measure of angle C?

∠A =  41

∠B = 82

∠C  = 57

Step-by-step explanation:

Sum of all the angles of triangle = 180

x + 10 + 2x -5 + 2x + 20 = 180

x +2x +2x + 10 - 5 +20 = 180     {Combine like terms}

5x + 25 = 180

         5x = 180 - 25

         5x =155

          x = 155/5

         x = 31

∠A = x + 10 = 31 + 10 = 41

∠B = 2x +20 = 2*31 + 20 = 62 + 20 = 82

∠C = 2x - 5 = 2*31 - 5 = 62 - 5 = 57

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation: