If Anthony has 4 classes and he does 30 minutes of homework for each class five nights a week. Then how many hours a week does Anthony spend doing his homework?

First spend the amount of time spent doing homework per day which is (4)(30) and then multiply this by the amount of times a week he studies which is (hours a day)(5)

Then you know that he spend 600 min a week for doing his homework.
BUT... you need to calculate how many HOURS, so............
1h_________60min
x___________600min
x=10hours a week!!!!!!