Ruth goes to school 8 hours a day and 5 days a week. She is in math class 25% of this time. How many hours per week does she spend in math class? Think carefully first, then make a decision:
She is in school for 40 hours because 5 x 8 = 40. She is in math class for 10 hours a week because 40 x .25 = 10. So, the answer is 10.