For BRAINILY :)
Triangle angle-sum theorem

s = 53

Step-by-step explanation:

We know that the three angle measures in a triangle add up to 180°. so…

(s - 20°) + 2s + 41° = 180°

Step 1. Subtract 41 from both sides

(s - 20°) + 2s = 139°

Step 2. Combine like terms

3s - 20 = 139°

Step 3. Add 20 from both sides

3s = 159

Step 4. Solve for s

s = 159/3

s = 53