1. **State the problem:** We are given three angles on a straight line: 65°, b°, and 20°. We know that the sum of angles on a straight line is 180°. 2. **Write the equation:** According to the problem, the sum of the angles is $$65 + b + 20 = 180$$ 3. **Simplify the equation:** Combine the known angles: $$65 + 20 = 85$$ So the equation becomes $$b + 85 = 180$$ 4. **Solve for b:** Subtract 85 from both sides: $$b + \cancel{85} - \cancel{85} = 180 - 85$$ $$b = 95$$ 5. **Conclusion:** The measure of angle b is 95 degrees. Therefore, the value of $b$ is $95$ degrees.