She previously had 2 cartons + 7 cartons = 9 cartons of berries. Emilia needs to buy 42 cartons - 9 cartons = 33 cartons of berries.
The answer: 33
Reverse engineering the question: Emilia needs 42 cartons of berries to make a berry cobbler. She already has 2 cartons of strawberries and 7 cartons of blueberries in her cupboard. She decides to go to the supermarket to get more cartons. How many more cartons of berries should Emilia buy?
Reasoning and answer: Elysse and her brother can carry 3 x 2 = 6 bags of groceries with each trip from the car. Therefore, it will take both of them 30 / 6 = 5 trips.
The answer: 5
What was the question?
Question: Elysse can carry 3 bags of groceries into her home with each trip from the car. Her brother can carry the same amount. How many trips will it take them to carry 30 bags of groceries?
If he uses 6 cups of flour, the baker will be making 6 / 2 = 3 times the normal amount that the recipe describes. Thus, he must use 3 * 3 = 9 eggs.
The answer: 9
Reverse engineering the question: A baker is making bread according to a recipe that requires him to use 3 eggs for every 2 cups of flour. If the baker wants to use up the 6 cups of flour he has remaining in his pantry, how many eggs will he need to use?
Reasoning and answer: Two pairs of socks cost $2 x 2 = $4. Jaco's total charge is $74 + $4 + $42 = $120. The amount that exceeds $100 is $120 - $100 = $20. So, Jaco has $20 x 10 / 100 = $2 discount. Therefore, Jaco will pay $120 - $2 = $118 for those items.
The answer: 118
What was the question?
Question: A department store offers a 10% discount for the amount exceeding $100 of the customer's total charge. Jaco bought a pair of shoes for $74; 2 pairs of socks that cost $2 per pair; a bag that costs $42. How much will Jaco pay for those items?
Housesitting = 15 * 10 = 150. Dog walking = 22 * 3 = 66. Total earned is 150 + 66 = $216.
The answer: 216
Reverse engineering the question: Charles can earn $15 per hour when he housesits and $22 per hour when he walks a dog. If he housesits for 10 hours and walks 3 dogs, how many dollars will Charles earn?
A red ticket is equal to 10 blue tickets, and a yellow is equal to ten red tickets, so a yellow ticket is also equal to 10 * 10 = 100 blue tickets. It takes 10 yellow tickets to win a Bible, or 10 * 100 = 1000 blue tickets. Tom has 8 yellow tickets, which are worth 8 * 100 = 800 blue tickets. He also has 3 red tickets, which are worth 3 * 10 = 30 blue tickets. Added with his 7 blue tickets, he has 800 + 30 + 7 = 837 blue tickets' worth of tickets. So he still needs to earn 1000 - 837 = 163 blue tickets.
The answer: 163
Reverse engineering the question:
To win a brand new Bible at Tom Sawyer's Sunday school, a pupil has to win 10 yellow tickets; each yellow ticket is obtained by trading in 10 red tickets; each red ticket is obtained by trading in 10 blue tickets; and blue tickets are earned by memorizing two Bible verses. But rather than go to all that trouble, Tom Sawyer has traded various toys and treasures of his with his friends until he has gathered 8 yellow, 3 red, and 7 blue tickets. How many more blue tickets would he need to earn to win a new Bible?