Cornelia visited 42 countries - 20 countries - 10 countries = 12 countries which were outside of Europe and South America. Half of those 12 countries were in Asia, so there were 12 countries / 2 = 6 Asian countries that Cornelia visited.
The answer: 6
Reverse engineering the question: Cornelia likes to travel. She visited already 42 different countries. 20 of them were in Europe and 10 in South America. From the rest of the countries, only half of them were in Asia. How many Asian countries has Cornelia visited?


Reasoning and answer: $1 is equivalent to 100 cents so $12.50 is equivalent to 100 * 12.50 = 1250 cents. He bought 25 oranges for 1250 cents so each orange cost 1250 / 25 = 50 cents each. If he sells each orange for 60 cents, he is making a profit of 60 - 50 = 10 cents on each one.
The answer: 10
What was the question?
Question: Joshua bought 25 oranges for $12.50. If he sells each one for 60c, how much profit in cents will he make on each orange?


Mrs. Brown has a $125 x 10 / 100 = $12.5 discount for her purchase. So, the remaining amount she needs to pay is $125 - $12.5 = $112.5. But Mrs. Brown can still avail of the 5% discount, so she has an additional discount of $112.5 x 4 / 100 = $4.5. Therefore, Mrs. brown will only pay $112.5 - $4.5 = $108.
The answer: 108
Reverse engineering the question: It's Mother's day, so mothers get a 10% discount on the department store. Mothers who have 3 children or more can get an additional 4% off the discounted price. If Mrs. Brown has 4 children and wants to buy a pair of shoes that costs $125, how much will she pay?


Reasoning and answer: Since one out of every 3 rows will contain tomato plants, there will be 15 / 3 = 5 rows of tomato plants. This gives her enough room to plant 5 rows * 8 plants / row = 40 tomato plants. The plants will produce a total of 40 * 3 = 120 tomatoes.
The answer: 120
What was the question?
Question: Aubrey is planting tomatoes and cucumbers in her garden. For each row of tomato plants, she is planting 2 rows of cucumbers. She has enough room for 15 rows of plants in total. There is enough space for 8 tomato plants in each row. If each plant produces 3 tomatoes, how many tomatoes will she have in total?


On her second birthday she adds $.5 because 2 x .25 = .5. On her third birthday she adds $.35 because 3 x .25 = .75. On her fourth birthday she adds $1 because 4 x .25 = 1. On her fifth birthday she adds $1.25 because 5 x .25 = 1.25. On her six birthday she adds $1.5 because 6 x .25 = 1.5. On her seventh birthday she adds $1.75 because 7 x .25 = 1.75. The total is $7 because .25 + .5 + .75 + 1 + 1.25 + 1.5 + 1.75 = 7.
The answer: 7
Reverse engineering the question: Every year, Mabel gets as many quarters as she is years old. She always puts these and nothing else in a piggy bank. When she turns 7, how much money is in the bank?


Bill gives each of his children 3 apples, so since he has two children this is 3 * 2 = 6 apples. Jill bakes 2 apple pies, using 10 apples each so this means she uses 10 * 2 = 20 apples. In total, this means 20 + 6 = 26 apples were used. Since Bill began with 50 apples, this means there are 50 - 26 = 24 apples remaining.
The answer: 24
Reverse engineering the question:
Bill picked 50 apples from the orchard with his wife and two children. He sends each of his kids to school with 3 apples for their two favorite teachers. His wife Jill bakes two apple pies, using 10 apples per pie. How many apples does Bill have left?