As a water quality assurance employee for local Aqua America, Inc branch record a drop in water levels from 28 feet to 7 feet at your reservoir. What is your percentage decrease?
Accepted Solution
A:
7 is 1/4 of 28, so 7 is 25% of 28. The drop from 28 to 7 is a drop of 21. 21 is 3 times 7, so 21 is 3 times 25%.