Q: Mark just got a new puppy that cost $10. He also bought enough food for 3 weeks. He knows the puppy eats 1/3 cup of food a day. A bag of food with 3.5 cups costs $2. How much did all of this cost him?
A: He needs food for 21 days because 3 x 7 = 21. The puppy will eat 7 cups of food because 21 x (1 / 3) = 7. He needs 2 bags of food because 7 / 3.5 = 2. The food will cost him $4 because 2 x 2 = 4. It will cost $14 in total because 10 + 4 = 14. The answer is 14.

Q: Boris has 24 books and he donates a fourth of his books to the library. Cameron has 30 books and he donates a third of his books to the library. After donating their books, how many books in total do Boris and Cameron have together?
A: Boris donates 24 / 4 = 6 books. Then Boris has a total of 24 - 6 = 18 books. Cameron donates 30 / 3 = 10 books. Then Cameron has a total of 30 - 10 = 20 books. Altogether, Boris and Cameron have 18 + 20 = 38 books. The answer is 38.

Q: Howard is taking his kindergarten class to the museum on a school trip. He splits the class equally into 3 groups and then each of the groups goes through the museum one student at a time. If the class has 18 students in total and each student takes 4 minutes to go through the museum, then how long, in minutes, does it take each group to go through the museum?
A:
As the groups are equally sized, they must each have 18 students in the class / 3 groups = 6 students in each group. So each group takes 6 students in each group * 4 minutes per each student’s trip = 24 minutes to go through the museum. The answer is 24.