How do you calculate the amount of water drawn in feet when the well's water level is 20 feet below the surface, and drops to 35 feet when the pump is active?

To determine the amount of water drawn in feet when the well's water level changes, the key is to look at the difference between the initial water level and the level when the pump is active.

In this scenario, the well's water level starts at 20 feet below the surface, and when the pump is activated, it drops to 35 feet below the surface. To find the amount of water drawn, subtract the initial level from the final level.

Initially, the water is at 20 feet, and when the pump operates, the water level drops to 35 feet. This means the well's water level has dropped an additional 15 feet (35 - 20 = 15). Thus, the total amount of water drawn during the pumping process is 15 feet.

This reasoning clarifies why the correct calculation results in 15 feet being drawn from the well.