[Question]In four years, Peter will be twice as old as Harriet. If Peter's age is currently half of his mother's age, who is 60, how old is Harriet now?
[Answer]If Peter's age is currently half of his mother's age, who is 60, Peter is 1 / 2 * 60 = 30 years old. In four years, Peter will be 30 + 4 = 34 years old. Since Peter's age in four years will be twice Harriet's age, Harriet will be 34 / 2 = 17 years old in four years. Currently, Harriet is 17 - 4 = 13 years old. The answer is 13.
Q: Sandro has six times as many daughters as sons. If he currently has three sons, how many children does he have?
A: If Sandro has three sons, the total number of daughters, six times the number of sons, is 3 sons * 6 daughters / son = 18 daughters. The total number of children is 18 daughters + 3 sons = 21 children. The answer is 21.
Question: Amy biked 12 miles yesterday. If she biked 3 miles less than twice as far as yesterday, how many miles did she bike in total in the two days?
Answer: Twice the distance Amy biked yesterday is 12 * 2 = 24 miles. If Amy biked 3 miles less than twice as far as yesterday, she biked 24 - 3 = 21 miles today. The total distance she biked in the two days is 21 + 12 = 33 miles. The answer is 33.
[Question]Vicky has an excellent internet connection. She can download up to 50 MB/second. She has to download a new program to finish a college assignment. The program's size is 360GB. If the internet connection is at maximum speed, how many hours does she have to wait until the program is fully downloaded? (There are 1000 MB per GB.)
[Answer]We have to know how many MB are 360GB, 360GB x 1,000MB / 1GB = 360,000 MB. The total seconds downloading will be 360,000MB 50MB / second = 7,200 seconds. So she has to wait 7,200 seconds 3,600 seconds / 1 hour = 2 hours. The answer is 2.
Q: 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?
A: 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: There are 10 cars parked in a mall's parking lot, each with the same number of customers inside. Each customer only makes 1 purchase. If the sports store makes 20 sales and the music store makes 30 sales, how many customers are in each of the cars?
Answer:
As each sale represents a customer, there must be a total of 20 sports store sales + 30 music store sales = 50 customers. There is an equal number of customers in every car, so there must be 50 total customers / 10 cars = 5 customers in each car. The answer is 5.