Amalia can read 4 pages of her book in 2 minutes. How many minutes will it take her to read 18 pages of her book? Give the rationale and then the answer.
Let's think step by step. Amalia can read 1 page in 2 / 4 = 0.5 minutes. Hence, she can read 18 pages in 18 x 0.5 minutes = 9 minutes.. The answer is: 9.

The chef has 60 eggs. He puts 10 eggs in the fridge and uses the rest to make cakes. If he used 5 eggs to make one cake, how many cakes did the chef make? Give the rationale and then the answer.
Let's think step by step. After putting 10 eggs in the fridge, the chef has 60 - 10 = 50 eggs left to make cakes. Since it takes 5 eggs to make one cake, the chef can make 50 eggs 5 eggs per cake = 10 cakes.. The answer is: 10.

Jimmy and Tonya both like collecting matchbooks and stamps. Tonya and Jimmy decide to trade some stamps and matchbooks. They have each decided that one stamp is worth 12 matches. Each matchbook contains 24 matches. If Tonya arrives with 13 stamps, Jimmy has 5 matchbooks, and Jimmy trades all his matchbooks for stamps, how many stamps does Tonya have left? Give the rationale and then the answer.
Let's think step by step. Jimmy has 120 matches because 5 times 24 equals 120. Jimmy trades this for 10 stamps because 120 divided by 12 equals 10. Tonya has 3 stamps left because 13 minus 10 equals 3.. The answer is: 3.