Frank has an apple tree in his backyard. 5 apples are hanging on the tree and 8 have fallen to the ground. If Frank's dog eats 3 of the apples off of the ground, how many apples are left? Give the rationale and then the answer.
Let's think step by step. Frank originally had 5 + 8 = 13 apples. After his dog eats 3, there are 13 - 3 = 10 apples.. The answer is: 10.

John assembles widgets at a factory. He can make 20 widgets an hour and works for 8 hours a day 5 days a week. How many widgets does he make a week? Give the rationale and then the answer.
Let's think step by step. He works 8 * 5 = 40 hours. So he made 20 * 40 = 800 widgets.. The answer is: 800.

Michelle is bringing sandwiches to work to give to her co-workers. She gives 4 sandwiches to one of her co-workers and keeps twice this amount for herself. If she had originally made 20 sandwiches, how many sandwiches does she have left to give to her other co-workers? Give the rationale and then the answer.
Let's think step by step. Michelle kept 4 sandwiches * 2 = 8 sandwiches for herself. This leaves 20 total sandwiches 4 sandwiches for a coworker 8 sandwiches for herself = 8 sandwiches for her other co - workers.. The answer is: 8.