Question: Darrel has 76 quarters, 85 dimes, 20 nickels and 150 pennies. If he drops all of his money into a coin-counting machine, they will convert his change into dollars for a 10% fee. How much will he receive after the 10% fee?
Answer: He has 76 quarters so that’s 76 * .25 = $19.00. He has 85 dimes so that’s 85 * .10 = $8.50. He has 20 nickels so that’s 20 * .05 = $1.00. He has 150 pennies so that’s 150 * .01 = $1.50. All total he has 19 + 8.5 + 1 + 1.5 = $30.00. They charge a 10% fee to count and convert his change into dollars so they will charge him .10 * 30 = $3.00. He had $30.00 and they charged him $3.00 in fees so he now has 30 - 3 = $27.00. The answer is 27.
[Question]Marie has 98 unread messages on her phone. She decides to clear them by reading 20 messages a day. However, she also gets 6 new messages a day. How many days will it take her to read all her unread messages?
[Answer]Marie will read 20 but gain 6 unread messages a day, so she will lower the number of messages by 20 - 6 = 14. Thus, it will take her 98 / 14 = 7 days to read all her unread messages. The answer is 7.
Q: Charlotte is making a pie. She can't decide if she will make cherry or blueberry. So she decides to make whichever pie is cheapest. Both pies will need $2 for flour, $1 for sugar and $1.5 for eggs and butter to make the crust. The blueberry pie needs 3 pounds of blueberries. The blueberries come in 8 oz containers for $2.25. For the cherry pie, she needs 4 pounds and they come in a four-pound bag for $14. What is the total price to make the cheapest pie?
A: The crust will cost $4.5 because 2 + 1 + 1.5 = 4.5. She will need 6 containers for blueberries because 3 x (8 / 16) = 6. The blueberries will cost $13.5 because 6 x 2.25 = 13.5. The blueberries are cheaper because 13.5 < 14. The blueberry pie will cost $18 to make because 4.5 + 13.5 = 18. The answer is 18.
Question: Megan’s grandma gave her $125 to start a savings account. She was able to increase the account by 25% from funds she earned babysitting. Then it decreased by 20% when she bought a new pair of shoes. Her final balance is what percentage of her starting balance?
Answer: Megan started with $125 and increased it by 25%, so $125 + (0.25)125 or $125 + $31.25 = $156.25. Then the balance decreased by 20%, so $156.25 – (0.20)156.25 or $156.25 - $31.25 = $125. $125 is the balance Megan started with, so her final balance is 100% of the starting balance. The answer is 100.
[Question]Hana sold 4/7 of her stamp collection for $28. How much would she have earned from selling the entire collection?
[Answer]Hana sold 4 / 7 of her collection for $28, so 1 / 7 of her collection represents: 28 / 4 = $7. And as a result, the entire collection represents: 7 * 7 = $49. The answer is 49.
[Question]Greg is riding his bike around town and notices that each block he rides, his wheels rotate 200 times. He's now on a a trail and wants to make sure he rides at least 8 blocks. His wheels have already rotated 600 times, how many more times do they need to rotate to reach his goal?
[Answer]
They need to rotate 1,600 times because 8 x 200 = 1,600. They need to rotate 1,000 more times because 1,600 - 600 = 1,000. The answer is 1000.