He starts with .25 + .25 = .5 pounds of vegetables a day. After doubling that it goes to .5 * 2 = 1 pound a day. So he eats 1 * 7 = 7 pounds of asparagus and broccoli per week. So he eats a total of 7 + 3 = 10 pounds of vegetables a week.
The answer: 10
Reverse engineering the question: James decides he needs to start eating more vegetables. He starts by eating a quarter pound of asparagus and a quarter pound of broccoli per day. After 2 weeks, he doubles that amount and adds 3 pounds of kale per week. How many pounds of vegetables does he eat a week after adding the kale?

The original price is x. The discount is 100% - 25% remaining = 75% discount. The discount is 75%, so the original price is x - .75x = .25x. The sale price is $6, so $6 = .25x, which is the same as 6 / .25 = x. X = $24.
The answer: 24
Reverse engineering the question: Macy's is selling shirts that have been reduced to $6. This price is at 25% of the original price. What was the original price?

Noah and Ava’s zoo entry tickets are $5 x 2 = $10. Their round trip bus fare will be $1.50 x 2 x 2 = $6. Zoo tickets and bus fare will cost $10 + $6 = $16. For lunch and snacks, they will have $40 - $16 = $24.
The answer: 24
Reverse engineering the question: Noah and Ava are planning a trip to the zoo. Zoo entry tickets are $5 per person. Bus fare is $1.50 per person one way. If they bring $40 with them, how much money do they have left to spend on lunch and snacks?

In class A, there are 40 / 100 * 80 = 32 students. In class B, the number of students is less by 21, which means class B has 32 - 21 = 11 students. That means 80 - 32 - 11 = 37 students are in class C.
The answer: 37
Reverse engineering the question:
Adam goes to a small school, which teaches 80 students in three classes. 40% of the students are in class A, and class B has 21 students fewer than class A. The rest are in class C. How many students are in this class?