It takes Mrs. Hughes 60 minutes to correct 15 math tests. How long would it take her to correct 60 math tests?
60 ÷ 15 = 4
4 minute per math test
4 × 60 = 240
240 minutes to correct 60 math tests =)
Use ration format 60:15, x:60 cross multiply and you will get 3600=15x. Divide both sides by 15 and x=240