Evan spent 20 hours doing homework last week. this week he spent 25 hours doing homework. he says that he spent 125% more time doing homework this week. is he correct? show your work to justify your decision.

To find the percent of something, put the percent in decimal form and multiply.

125% = 125/100 = 1.25

Now here's the problem with the wording: He spent 125% of the previous time doing his homework, but only 25% more time!

(If you wanted to find out how much MORE time, subtract 25 from 20 and you'll see that he did 5 more hours this week. 20 times 0.25 = 5. (0.25 = 25%))
So no, Evan did not spent 125% more time doing his homework this week.