[Question]Derek was 6 years old when he had three times as many dogs as cars. Ten years later, after selling some of his dogs and buying 210 more cars, the number of cars became twice the number of dogs. How many dogs does Derek have now if he had 90 dogs when he was six years old?
[Answer]At six years old, with three times as many dogs as cars, Derek had 90 / 3 = 30 cars. Ten years later, after buying 210 more cars, Derek has 210 + 30 = 240 cars. Since the number of cars is twice as many as the number of dogs, Derek currently has 240 / 2 = 120 dogs. The answer is 120.
Q: Billy ate 20 apples this week. On Monday, he ate 2 apples. On Tuesday, he ate twice as many as he ate the day before. He's not sure what he ate on Wednesday. On Thursday, he ate four times as many as he ate on Friday. On Friday, he ate half of the amount he ate on Monday. How many apples did he eat on Wednesday?
A: On Tuesday, Billy ate 2 * 2 = 4 apples. On Friday, he ate 2 * 0.5 = 1 apple. On Thursday, he ate 4 * 1 = 4 apples. So for Monday, Tuesday, Thursday, and Friday, Billy ate a total of 2 + 4 + 4 + 1 = 11 apples. This means that on Wednesday, he must have eaten 20 11 = 9 apples. The answer is 9.
Question: A school does a yearly tree planting activity. This year, the 4th graders planted a total of 30 trees while 5th graders planted twice as many. The 6th graders planted 30 fewer than thrice the number of trees planted by the 5th graders. How many trees did they plant altogether?
Answer: The 5th graders planted 30 x 2 = 60 trees. Thrice the number of trees planted by the 5th graders is 60 x 3 = 180. So, the 6th graders planted 180 - 30 = 150 trees. Therefore, they planted a total of 30 + 60 + 150 = 240 trees. The answer is 240.
[Question]John decides to buy utensils. They come in 30 packs with an equal number of knives, forks, and spoons. How many packs does he need to buy if he wants 50 spoons?
[Answer]Each pack contains 30 / 3 = 10 spoons. So he needs to buy 50 / 10 = 5 packs. The answer is 5.
Q: Alan went to the market and bought 20 eggs at the price of $2 per egg. He bought 6 chickens for the price of $8 per chicken. How much money did Alan spend at the market?
A: The cost of 20 eggs is 20 * $2 = $40. The cost of 6 chickens is 6 * $8 = $48. The total amount Alan spent at the market is $40 + $48 = $88. The answer is 88.
Question: Natalie has $26 to go shopping. She bought a jumper for $9, a T-shirt for $4, and a pair of heels for $5. How much money does Natalie have left?
Answer:
The total cost of the clothes is $9 + $4 + $5 = $18. Natalie has $26 $18 = $8 left. The answer is 8.