Ben ate 4 + 3 = 7 eggs yesterday. So he will have left 20 - 7 = 13 eggs.
The answer: 13
Reverse engineering the question: Ben has 20 eggs in the fridge. Yesterday, he ate 4 eggs in the morning and 3 in the afternoon. How many eggs does Ben have now?


Reasoning and answer: Carla is currently 2 + 2 = 4 years old. Ty is currently (2 * 4) + 4 = 12 years old. In 5 years, Frank will be 12 * 3 = 36 years old.
The answer: 36
What was the question?
Question: In 5 years, Frank will be three times as old as Ty is now. Ty is currently 4 years more than two times as old as Carla is now. Carla is currently 2 years older than Karen is now. If Karen is currently 2 years old, how old will Frank be in 5 years?


There are 40 / 2 = 20 women at the event. Hence, there are a total of 40 + 20 = 60 men and women at the event. So, the total number of children at the event is 80 - 60 = 20. After Oleg added 10 children to the guest list, there are a total of 20 + 10 = 30 children.
The answer: 30
Reverse engineering the question: Oleg is an event organizer. He is organizing an event with 80 guests where 40 of them are men, half the number of men are women, and the rest are children. If he added 10 children to the guest list, how many children will there be at the event?


Reasoning and answer: For the chocolate cakes: Leila should pay: 12 * 3 = $36. For the strawberry cakes: Leila should pay: 22 * 6 = $132. Combining the chocolate cakes and strawberry cakes, Leila should pay: 36 + 132 = $168.
The answer: 168
What was the question?
Question: Ali is a baker. Leila ordered 3 chocolate cakes for $12 each and 6 strawberry cakes for $22 each. How much should Leila pay Ali?


It will take Sheena 12 hours x 5 bridesmaids = 60 hours to sew the dresses. It will take her 60 hours / 4 hours = 15 weeks.
The answer: 15
Reverse engineering the question: Sheena is sewing the bridesmaid’s dresses for her sister’s wedding. She can sew one dress in 12 hours. There are 5 bridesmaids in the wedding. If Sheena sews the dresses 4 hours each week, how many weeks will it take her to complete them?


The normal price of the lessons would be 20 * 40 = $800. The discount saves him 800 * .25 = $200. So the lessons cost him 800 - 200 = $600. That means everything costs 500 + 600 = $1100.
The answer: 1100
Reverse engineering the question:
John decides to learn how to play the piano. He buys a piano for $500. He then hires a teacher for 20 lessons at $40 per lesson but ends up getting a 25% discount. How much did everything cost?