Question: There are 480 zombies in the shopping mall. If the number of zombies doubled every day, how many days ago were there less than 50 zombies in the mall?
Answer: First find how many zombies there were one day ago: 480 zombies / 2 = 240 zombies. Then find how many zombies there were two days ago: 240 zombies / 2 = 120 zombies. Then find the number of zombies there were three days ago: 120 zombies / 2 = 60 zombies. Then find the number of zombies there were four days ago: 60 zombies / 2 = 30 zombies, which is less than 50, so there were less than 50 zombies 4 days ago. The answer is 4.
[Question]Leila bought a living room set consisting of a sofa worth $1,250, 2 armchairs costing $425 each and a coffee table. The total amount of the invoice is $2,430. What is the price of the coffee table?
[Answer]The price of 2 armchairs is $425 x 2 = $850. Mrs. Dubois will pay $850 for the 2 seats. Thus the Coffee table price is $2,430 ($1,250 + $850) = $2,430 $2,100 = $330. The answer is 330.
Q: Kennedy's car can drive 19 miles per gallon of gas. She was able to drive 15 miles to school, 6 miles to the softball park, 2 miles to a burger restaurant, 4 miles to her friend's house, and 11 miles home before she ran out of gas. How many gallons of gas did she start with?
A: Kennedy drove 15 + 6 + 2 + 4 + 11 = 38 miles. She gets 19 miles per gallon of gas, so she started with 38 / 19 = 2 gallons of gas. The answer is 2.
Question: Ibrahim wants to buy an MP3 player for 120 euros and a CD for 19 euros. He has 55 euros in savings. His father participates in his purchase by giving him 20 euros. How much money does Ibrahim lack?
Answer: The total price of the purchases is 120 + 19 = 139 euros. The amount of money he has after his father's help is 55 + 20 = 75 euros. The purchase amount is 139 euros, so he is missing 139 75 = 64 euros. The answer is 64.
[Question]John drives 1000 miles a month. He needs to get an oil change every 3000 miles. He gets 1 free oil change a year. If an oil change costs $50, how much does he pay a year?
[Answer]He needs to get an oil change every 3000 / 1000 = 3 months. So he gets 12 / 3 = 4 oil changes a year. That means he pays for 4 - 1 = 3 oil changes a year. So he pays 3 * $50 = $150 a year. The answer is 150.
[Question]Trevor and two of his neighborhood friends go to the toy shop every year to buy toys. Trevor always spends $20 more than his friend Reed on toys, and Reed spends 2 times as much money as their friend Quinn on the toys. If Trevor spends $80 every year to buy his toys, calculate how much money in total the three spend in 4 years.
[Answer]
If Trevor spends $20 more than Reed every year to buy toys, Reed spends $80 - $20 = $60. Since Reed uses $60 every year to buy toys, his friend Quinn uses 60 / 2 = $30 every year to buy toys. The total amount of money the three spend in a year together to buy toys is $30 + $60 + $80 = $170. The total amount of money the three will use to buy toys in 4 years is $170 * 4 = $680. The answer is 680.