Question: Ali had a stock of 800 books in his Room. He sold 60 on Monday, 10 on Tuesday, 20 on Wednesday, 44 on Thursday and 66 on Friday. How many books were not sold?
Answer with step-by-step thinking: We look first for the total number of books that were sold: 60 + 10 + 20 + 44 + 66 = 200 books. So the total number of books that were not sold is: 800 200 = 600 books.
So the answer is 600.

Question: Leila went to the supermarket to buy food for the Christmas party. She bought apples for 5, sugar for 3 and carrots for 17. She paid with a 50 bill. How much money does the saleswoman return to her?
Answer with step-by-step thinking: To find out how much the saleswoman should give her back, we have to find out first how much she spent. She bought apples for 5, sugar for 3 and carrots for 17, so she spent 5 + 3 + 17 = 25. She pays 50 and the saleswoman must keep 25, so the seller must give her back 50 - 25 = 25.
So the answer is 25.

Question: A small theater company sells tickets to a show. They have a 400 seat theater and fill to 80% capacity. Each ticket cost $30. They repeated the same performance 2 other days. How much did they make?
Answer with step-by-step thinking:
They sold 400 * .8 = 320 tickets each day. So each day they made 320 * 30 = $9600. They did 2 + 1 = 3 days. So they made 9600 * 3 = $28,800.
So the answer is 28800.