Question: Roxanne bought 2 cups of lemonade for $2 each and 2 sandwiches for $2.50 each. How much change must she get from a $20 bill?
Answer: Two cups of lemonade amount to $2 x 2 = $4. Two sandwiches amount to $2.50 x 2 = $5. So, the total amount that Roxanne had to pay was $4 + $5 = $9. Thus, her change must be $20 - $9 = $11. The answer is 11.
[Question]In 5 years, Joey will be as old as Beth is now. If Joey is 9 now, how old was Joey when Beth was Joey's age now?
[Answer]Beth is 5 + 9 = 14 now. Beth was 9 years old 14 - 9 = 5 years ago. Joey was 9 - 5 = 4. The answer is 4.
Q: Carolyn buys a silverware set with 6 knives, 12 forks, and three times as many spoons as knives. Then her friend trades her 10 knives for 6 spoons. What percentage of Carolyn's silverware is knives?
A: First find the final number of knives Carolyn has: 10 knives + 6 knives = 16 knives. Then find the initial number of spoons Carolyn has: 6 knives * 3 spoons / knife = 18 spoons. Then find the final number of spoons Carolyn has: 18 spoons - 6 spoons = 12 spoons. Then find the total final amount of silverware Carolyn has: 12 spoons + 16 knives + 12 forks = 40 pieces. Then divide the number of knives by the total number of pieces and multiply by 100% to express the answer as a percentage: 16 knives / 40 pieces * 100% = 40%. The answer is 40.
Question: James has 20 pairs of red socks and half as many black socks. He has twice as many white socks as red and black combined. How many total socks does he have combined?
Answer: He has 20 / 2 = 10 black socks. So he has 20 + 10 = 30 black and red socks. So he has 30 * 2 = 60 white socks. So he has 60 + 30 = 90 total socks. The answer is 90.
[Question]Fifteen more than a quarter of a number is 27. What is the number?
[Answer]A quarter of the number is 27 - 15 = 12. The number is 12 * 4 = 48. The answer is 48.
[Question]Ian spent half the money he made on doing online surveys. If he worked 8 hours doing surveys and on average he's able to earn $18 per hour doing surveys, how much money does he have left?
[Answer]
Ian is able to earn $18 per hour doing surveys. If he worked 8 hours doing surveys, then he earned $18 * 8 = $144. If he spent half of what he earned, then he spent $144 * 50% = $72. If Ian spent $72 of his earnings, then he has $144 - $72 = $72 left. The answer is 72.