The effort applied to move a load is 15 units and the machine advantage is observed to be 3. Find the load.

Correct option is B

Mechanical Advantage (MA) is typically defined as
MA = $$\frac{\text{Load (output force)}}{\text{Effort (input force)}}.$$​
Given MA = 3 and Effort=15 units, the load is:
Load = MA × Effort = 3 × 15 = 45 units.