During a weight loss challenge your friend goes from 125pounds to 100 pounds. What was the percent weight loss?

Percent decrease = (original number - new number) / original number ... x 100

percent decrease : (125 - 100) / 125 ... x 100

25/125 = 0.2 ... x 100 = 20% decrease

Percent change=change/original times 100

change=125-100=25

original=125

percent change=25/125 times 100

percent change=1/5 times 100

percent change=0.20 times 100

percent change=20%

answer is 20%