0.025 10 19.5 40
I gave my students this multiple choice question: A screwdriver is used to pry the lid off a paint can. The resistance arm is 0.5 centimeters. The effort arm is 20 centimeters. What is the mechanical advantage of the screwdriver?

Only one answer is correct among these 4 choices:
- 0.025
- 10
- 19.5
- 40

Could you tell me which one is correct?

40