[Question]: Adam has just bought some new books so he has decided to clean up his bookcase. After he adds his new books to his bookshelf he realizes that he has bought enough books to finish completely filling his bookcase with 2 books left over. Before his shopping trip, Adam had 56 books in his bookcase. If his bookcase has 4 shelves and averages 20 books per shelf, how many books did Adam buy on his shopping trip?
[Answer]: Adam's bookshelf has 4 shelves that fit 20 books each, which is 4 * 20 = 80 books in total to fill the bookshelf. Adam ended the day with a full bookcase of 80 books in the bookcase and 2 books left over, 80 + 2 = 82 books total. If Adam started the day with 56 books and ended the day with 82 books then Adam bought 82 - 56 = 26 books bought on his shopping trip.
So the answer is 26.

[Question]: Rachel makes $12.00 as a waitress in a coffee shop. In one hour, she serves 20 different people and they all leave her a $1.25 tip. How much money did she make in that hour?
[Answer]: She served 20 people and they all tipped her $1.25 so she made 20 * 1.25 = $25.00 in tips. She makes $12.00 an hour and she made $25.00 in tips so she made 12 + 25 = $37.00 in one hour.
So the answer is 37.

[Question]: Kim has 12 nail polishes. Heidi has 5 more nail polishes than Kim, and Karen has 4 fewer nail polishes than Kim. How many nail polishes does Karen and Heidi have together?
[Answer]:
Heidi has 12 + 5 = 17 nail polishes. Karen has 12 - 4 = 8 nail polishes. Heidi and Karen have 17 + 8 = 25 nail polishes together.
So the answer is 25.