The necklace stand needs another 12 – 5 = 7 necklaces. This will cost the store 7 * 4 = $28. The ring display needs another 30 – 18 = 12 rings. This will cost the store 12 * 10 = $120. The bracelet display needs another 15 – 8 = 7 bracelets. This will cost the store 7 * 5 = $35. In total, the store needs to pay 28 + 120 + 35 = $183.
The answer: 183
Reverse engineering the question: A jewelry store is restocking its shelves. The necklace stand, which can hold 12 necklaces, currently holds 5 necklaces. The ring display, which can hold 30 rings, currently holds 18 rings. The bracelet display, which can hold 15 bracelets, currently holds 8 bracelets. The store’s supplier charges $4 per necklace, $10 per ring, and $5 per bracelet. How much, in dollars, will the store need to pay to fill the displays?


Reasoning and answer: Lenny has 20 x 5 = 100 pens. She gave her close friends 100 x 40% = 40 pens. So, 100 - 40 = 60 pens were left. Half of 60 is 60 / 4 = 15 pens. Thus, Lenny has 60 - 15 = 45 pens left.
The answer: 45
What was the question?
Question: Lenny bought 20 boxes of pens. Each box contained 5 pens. She gave 40% of the pens to her close friends and one-fourth of what's left to her classmates. How many pens were left for Lenny?


On Monday and Tuesday, she eats 2 * 2 = 4 candies. On the other days of the week, she eats 5 * 1 = 5 candies. In a week she eats 5 + 4 = 9 candies. So it takes 36 / 9 = 4 weeks for Lisa to eat all candies.
The answer: 4
Reverse engineering the question: Lisa has 36 candies. On Mondays and Wednesdays, she eats 2 candies for each day and on the other days of the week she eats 1 candy for each day. How many weeks does it take for Lisa to eat all of the candies?


Reasoning and answer: On the third day, Jen had half of the second day’s cookies left, so on the second day, she had 8 * 2 = 16 cookies. On the second day, she had 1 / 4 of the first day’s cookies left, so she started with 16 * 4 = 64 cookies in the bag.
The answer: 64
What was the question?
Question: Jen bought a bag of cookies and ate three-quarters of the bag that day. The next day, she ate half of the remaining cookies. She has 8 cookies left on the third day. How many cookies were in the bag to start?


He has 75 green caps because 125 - 50 = 75. The proportion of caps that are green is .6 because 75 / 125 = .6. The percentage that are green is 60 because .6 x 100% = 60%.
The answer: 60
Reverse engineering the question: Ali is collecting bottle caps. He has 125 bottle caps. He has red ones and green ones. If he has 50 red caps, what percentage of caps are green?


From 8:00 to 11:00, Mckenna spends 11:00 - 8:00 = 3 hours at work. When she joins the developers in the conference room for the meeting, she spends an additional 13:00 - 11:00 = 2 hours at work. So far, she has spent 3 + 2 = 5 hours at work. When she works for an additional 2 hours before heading home, her total work hours become 5 + 2 = 7 hours.
The answer: 7
Reverse engineering the question:
Mckenna starts her day at 8:00 a.m. She works in her office up to 11:00 a.m. then joins her team of developers at the conference room to talk about projects up to 13:00, from which she works for another two hours and then heads home. How many hours does Mckenna stay at work?