Question: A spiral notebook costs $15, and a personal planner costs $10. How much would it cost in total to buy 4 spiral notebooks and 8 personal planners at a 20% discount?
Answer: If a spiral notebook cost $15, a 20% discount would reduce the price by 20 / 100 * 15 = $3. At a 20% discount, the buying price of a spiral notebook book is $15 - $3 = $12. At the same discount, a personal planner cost would reduce by 20 / 100 * $10 = $2. The new buying price of a personal planner will be $10 - $2 = $8. To buy four spiral notebooks at a 20% discount, you'll pay 4 * $12 = $48. At the same time discount, you'll buy eight personal planners at a cost pf 8 * $8 = 64. In total, to buy eight personal planners and four spiral notebooks, you'd have to pay $64 + $48 = $112. The answer is 112.

Question: Kimiko is retiling her kitchen floor. Each tile is 6 square inches. If her kitchen is 48 inches by 72 inches, how many tiles does Kimiko need to buy?
Answer: First figure out how many tiles are in one row by dividing the kitchen's width by each tile's width: 48 inches / 6 inches / tile = 8 tiles in one row. Then figure out how many rows of tiles there are by dividing the kitchen's height by each tile's height: 72 inches / 6 inches / tile = 12 rows of tiles. Then multiply the number of rows by the number of tiles per row to find the total number of tiles Kimiko needs to buy: 8 tiles / row * 12 rows = 96 tiles. The answer is 96.

Question: Annie has $120. The restaurant next door sells hamburgers for $4 each. The restaurant across the street sells milkshakes for $3 each. Annie buys 8 hamburgers and 6 milkshakes. How much money, in dollars, does she have left?
Answer: Annie spends 4 * 8 = 32 dollars on hamburgers. Annie spends 3 * 6 = 18 dollars on milkshakes. Annie spends 32 + 18 = 50 dollars on hamburgers and milkshakes. Annie has 120 - 50 = 70 dollars left. The answer is 70.

Question: Marcos has to get across a 5 mile lake in his speedboat in 10 minutes so he can make it to work on time. How fast does he need to go in miles per hour to make it?
Answer:
10 minutes for 5 miles means 10 minutes / 5 miles = 2 minutes / mile. 1 hour is 60 minutes so 60 minutes / hour / 2 minutes / mile = 30 miles / hour. The answer is 30.