Last year Ella made a total of $100 / (40 / 100) = $250. This year with her raise, Ella's salary will be $250 * (110 / 100) = $275.
The answer: 275
Reverse engineering the question: Ella spends 40% of the money she makes from babysitting on video games. Last year she spent $100. This year she received a 10% raise. What is Ella's new salary?
Reasoning and answer: He buys 4 * 30 = 120 stickers. That means it cost 120 * .1 = $12. So he pays 12 * .5 = $6.
The answer: 6
What was the question?
Question: James splits 4 packs of stickers that have 30 stickers each. Each sticker cost $.10. If his friend pays for half how much did James pay?
First find the area of the lot by multiplying the width and the length: 120 ft * 60 ft = 7200 sq ft. Then find the area of the square covered in concrete: 40 ft * 40 ft = 1600 sq ft. Then subtract the concrete area from the total area to find the grassy area: 7200 sq ft - 1600 sq ft = 5600 sq ft. Finally, divide this area by the area each bag covers to find the number of bags: 5600 sq ft / 56 sq ft / bag = 100 bags.
The answer: 100
Reverse engineering the question: Amanda is figuring out how many bags of grass seed she needs to buy to cover a new lot the city is turning into a park. The lot measures 120 feet by 60 feet. One section that measures 40 feet by 40 feet will be covered with concrete, and the rest needs to be covered in grass seeds. Each bag of grass seeds covers 56 square feet. How many bags of grass seeds does Amanda need?
Reasoning and answer: There are a total of 14 apples / box x 3 boxes = 42 apples in the 3 boxes. So, Henry and his brother each have 42 apples / 2 people = 21 apples / person to consume. Since there are 7 days in a week, thus, both of them can consume the 3 boxes of apples in 21 / 7 = 3 weeks.
The answer: 3
What was the question?
Question: Henry believes in the famous phrase, "An apple a day, keeps the doctor away." If a box contains 14 apples, how many weeks can Henry and his brother spend eating 3 boxes of apples if they each eat 1 apple a day?
Joanna has $8. Joanna's brother has thrice as much as Joanna, so he has $8 * 3 = $24. Her sister has half as much as Joanna, then she has $8 / 2 = $4. Together they have $8 + $24 + $4 = $36 altogether.
The answer: 36
Reverse engineering the question: Joanna has $8. Compared to her money, her brother has thrice as much while her sister has only half as much. How much money do the three of them have altogether?
One clerk can process 25 x 8 = 200 forms in a day. To process the forms for that day 2400 / 200 = 12 clerks must be hired.
The answer: 12
Reverse engineering the question:
A clerk can process 25 forms per hour. If 2400 forms must be processed in an 8-hour day, how many clerks must you hire for that day?