At​ noon, a tank contained 20 cm of water. After several​ hours, it contained 18 cm of water. What is the percent decrease of water in the​ tank?

Answer 1

To find the percent decrease in water, we need to calculate the difference in water level and then express it as a percentage of the original water level.

Initial water level = 20 cm
Final water level = 18 cm

Difference in water level = 20 cm - 18 cm = 2 cm

Percent decrease = (2 cm / 20 cm) x 100% = 10%

Therefore, the water level in the tank decreased by 10%.