2% of $90 is (2 / 100) * $90 = $1.8. 2% of $60 is (2 / 100) * $60 = $1.2. The second transaction was reversed without the service charge so only a total of $90 + $1.8 + $1.2 = $93 was deducted from his account. He will have a balance of $400 - $93 = $307.
The answer: 307
Reverse engineering the question: Paul made two bank transfers of $90 and $60 respectively. A service charge of 2% was added to each transaction. If the second transaction was reversed (without the service charge), what is his account balance now if it was $400 before he made any of the transfers?


Reasoning and answer: First find the total number of scrunchies: 6 barrettes * 2 = 12 scrunchies. Then subtract three fewer bobby pins than barrettes 6 - 3 = 3 bobby pins. Then add the number of each type of hair decorations to find the total number: 6 decorations + 12 decorations + 3 decorations = 21 decorations. Then divide the number of bobby pins by the total number of decorations and multiply by 100% to express the answer as a percentage: 3 bobby pins / 21 decorations * 100% = 14.28 which rounds down to 14%.
The answer: 14
What was the question?
Question: Annie has 6 barrettes, twice as many scrunchies as barrettes, and three fewer bobby pins than barrettes. What percentage of her hair decorations are bobby pins, rounded to the nearest percent?


You doubled a number to get 188 so in reverse, you would divide by 2 so 188 / 2 = 94. You added 4 to this number and in reverse, you would subtract by 4 so 94 - 4 = 90. You doubled a number to get 90 so in reverse you would divide by 2 so 90 / 2 = 45 is the fastest speed.
The answer: 45
Reverse engineering the question: If you take the fastest speed of a rabbit and double it, add 4 to that then double it again you get 188. How fast is the rabbit?


Reasoning and answer: The dinner cost 10 + 2.5 = $12.5. The tip comes to 12.5 * .2 = $2.5. So the total cost is 12.5 + 2.5 = $15. That means she gets 20 - 15 = $5 in change.
The answer: 5
What was the question?
Question: Kim orders a $10 meal and a drink for 2.5. She gives a 20% tip. She pays with a $20 bill. How much does she get in change?


If they spent two more weeks on their second research expedition than they spent on the first week, they spent 2 + 3 = 5 weeks on the island. In the two expeditions, they stayed on the island for a total of 5 + 3 = 8 weeks. On their third expedition, they spent twice as many weeks as they spent on the second week on the island, which is 2 * 5 = 10 weeks. In all three expeditions, they stayed on the island for 10 + 8 = 18 weeks. Since a week has seven days, they spent 18 * 7 = 126 days on the island.
The answer: 126
Reverse engineering the question: Jodi and Vance are researching on a deserted island and have to stay on the island for a certain number of weeks to carry out their research. On their first expedition, they stayed for three weeks on the island. They spent two weeks more on the second expedition than they spent on their first expedition. They spent twice as many weeks on their last expedition as they spent on their second expedition. Calculate the total number of days they spent on the island on all the trips.


The cost of labor is 75 * 8 = $600. So Bobby pays 600 * .8 = $480. So that means Bobby pays 480 + 250 = $730.
The answer: 730
Reverse engineering the question:
Bobby needs to buy a new pair of fancy shoes. He decides to go to a cobbler and get them handmade. The cobbler charges $250 to make the mold. He then charges $75 an hour for 8 hours to make the shoes. The cobbler agrees to only charge 80% of the cost for work to make the shoes, since it is his first pair of shoes. How much did Bobby pay?