There are 4 quarters in every dollar, so $35 x 4 = 140 quarters. Libby has 160 quarters – 140 quarters to repay her sister = 20 quarters left.
The answer: 20
Reverse engineering the question: Libby has 160 quarters in her piggy bank. She has to pay $35 to replace her sister’s dress that she borrowed and ruined. After replacing the dress, how many quarters will Libby have left?


Reasoning and answer: As the number of cakes doubles each day, Marjorie must have made 320 cakes / 2 = 160 cakes on the fifth day. So on the fourth day, she must have made 160 cakes / 2 = 80 cakes. This means that on the third day, she made 80 cakes / 2 = 40 cakes. On the second day, she made 40 cakes / 2 = 20 cakes. So on the first day, she made 20 cakes / 2 = 10 cakes.
The answer: 10
What was the question?
Question: Marjorie works as a baker. Every day, she makes twice as many cakes as she did the day before. On the sixth day, she makes 320 cakes. How many cakes did Marjorie make on the first day?


First find how many hours he spends studying by dividing the number of hours spent gaming by 3: 9 hours / 3 = 3 hours. Then multiply that quantity by the point increase per hour to find Jackson's grade: 3 hours * 15 points / hour = 45 points.
The answer: 45
Reverse engineering the question: Jackson spends 9 hours playing video games and 1/3 that much time studying. If Jackson's grade starts at 0 points and increases by 15 points for every hour he spends studying, what is his grade?


Reasoning and answer: She spent 4 x $1.50 = $6 for the lollipops. She also spent 2 x $2 = $4 for the gummies. Therefore, Chastity was left with $15 - $10 = $5.
The answer: 5
What was the question?
Question: Chastity bought 4 lollipops which cost $1.50 each, and she also bought 2 packs of gummies which cost $2 each. If she has $15, how much was she left with after spending on the candies?


Single layer cake slices cost $4 x 7 = $28. Double layer cake slices cost $7 x 5 = $35. All the cake slices together cost $28 + $35 = $63. He will receive change of $100 - $63 = $37.
The answer: 37
Reverse engineering the question: At the patisserie, a single layer cake slice is $4 and a double layer cake slice is $7. Dusty buys 7 single layer cake slices and 5 double layer cake slices. If he pays with a $100 bill, how much change does he receive?


He saw 25 total vehicles because 12 plus 13 equals 25. He saw 100 wheels because 25 times 4 equals 100.
The answer: 100
Reverse engineering the question:
Tommy goes for a run around his neighborhood and decides to calculate how many wheels he saw. All the trucks in his neighborhood have 4 wheels and all the cars in his neighborhood also have 4 wheels. If he saw 12 trucks and 13 cars, how many wheels did he see?