Question: The price of a book was $400. If the book's price is decreased by 15% and then increased by 40%, what is the final price of the book?
Answer: When the price of the book is decreased by 15%, the total price decrease is 15 / 100 * $400 = $60. The new price of the book becomes $400 - $60 = $340. The price of the book is then increased by 40 / 100 * 340 = $136. The final price of the book is $340 + $136 = $476. The answer is 476.
[Question]Wade has called into a rest stop and decides to get food for the road. He buys a sandwich to eat now, one for the road, and one for in the evening. He also buys 2 drinks. If the drinks cost $4 each and Wade spends a total of $26 then how much, in dollars, did the sandwiches each cost?
[Answer]The drinks cost a total of $4 per drink * 2 drinks = $8. So the sandwiches cost a total of $26 total spending - $8 spending on drinks = $18. Therefore, each sandwich costs $18 for sandwiches / 3 sandwiches = $6. The answer is 6.
Q: Kenneth spent 10% of this earnings this week on a new joystick. If he is left with $405, how much were his earnings?
A: Since Kenneth spent 10%, then he is left with 100% - 10% = 90% of his earnings. Since 90% of his earnings is worth $405, then 1% of his earnings is $405 / 90 = $4.50. Hence, Kenneth's earnings is $4.50 x 100 = $450. The answer is 450.
Question: The Parker family needs to leave the house by 5 pm for a dinner party. Mrs. Parker was waiting to get into the bathroom at 2:30 pm. Her oldest daughter used the bathroom for 45 minutes and her youngest daughter used the bathroom for another 30 minutes. Then her husband used it for 20 minutes. How much time will Mrs. Parker have to use the bathroom to leave on time?
Answer: Between 2:30 pm and 5:00 pm, there are 2.5 hours. There are 60 minutes in an hour, so 2.5 hours x 60 = 150 minutes. Her family was in the bathroom 45 + 30 + 20 = 95 minutes. Mrs. Parker has 150 minutes 95 minutes = 55 minutes in the bathroom. The answer is 55.
[Question]Jill can run up a hill at 9 feet/second and down a hill at 12 feet/second. How long does it take her to run up and down a 900 foot hill?
[Answer]First find the time it takes Jill to run up the hill: 900 feet / 9 feet / second = 100 seconds. Then find the time it takes Jill to run down the hill: 900 feet / 12 feet / second = 75 seconds. Then add the two times to find Jill's total time: 100 seconds + 75 seconds = 175 seconds. The answer is 175.
[Question]It costs $.10 to print one page. Jenny wants to print 7 copies of her 25-page essay. She also wants to buy 7 pens that each cost $1.50. If she pays the store with 2 twenty dollar bills, how much money should she get in change?
[Answer]
Jenny needs to print 7 * 25 = 175 pages. This will cost 175 * $.10 = $17.5. The pens will cost 7 * $1.50 = $10.50. In total, she will spend $17.5 + $10.5 = $28. Since she pays with 2 twenty dollar bills she pays with 2 * 20 = 40 dollars. Thus, she will get $40 - $28 = $12 in change. The answer is 12.