The total cost of Olivia's groceries was $42. The bananas cost her $12, the bread cost her $9, and the milk cost her $7. The only other groceries she bought were apples. In dollars, how much money did the apples cost her? Give the rationale and then the answer.
Let's think step by step. The combined cost of the bananas, bread, and milk was 12 + 9 + 7 = $28. The difference between this and the total is the cost of the apples, which must have therefore cost Olivia 42 28 = $14.. The answer is: 14.

Maddy was given 40 chocolate eggs for Easter. She likes to eat two each day after school. If Maddy has two chocolate eggs after school each day, how many weeks will they last? Give the rationale and then the answer.
Let's think step by step. Maddy is eating 2 eggs each day after school and there are 5 school days in a week, so she eats 2 x 5 = 10 eggs each week. Since Maddy has 40 eggs / 10 eggs each week, they will last 4 weeks.. The answer is: 4.

A dog is being treated for fleas. One flea treatment gets rid of half the fleas. After four treatments, the dog has 14 fleas left. How many more fleas did the dog have before the flea treatments than after? Give the rationale and then the answer.
Let's think step by step. After three treatments, the dog had 14 * 2 = 28 fleas. After two treatments, the dog had 28 * 2 = 56 fleas. After one treatment, the dog had 56 * 2 = 112 fleas. Before any treatments, the dog had 112 * 2 = 224 fleas. Thus, the dog had 224 - 14 = 210 more fleas before the treatments than after.. The answer is: 210.