For 4 days, Ivy consumes 2.5 x 4 = 10 liters of water. So Ivy should buy 10 / 2 = 5 bottles of 2 - liter water.
The answer: 5
Reverse engineering the question: Ivy drinks 2.5 liters of water each day. How many bottles of 2-liter water should Ivy buy for her 4 days consumption?

If the restaurant makes 60 hot dogs and 40 more pizzas than hot dogs every day, it makes 60 + 40 = 100 pizzas. The total number of pizzas and hot dogs it makes in a day is 100 + 60 = 160. In June, with thirty days, the restaurant will make 30 * 160 = 4800 pizzas and hot dogs in total.
The answer: 4800
Reverse engineering the question: A restaurant makes 40 more pizzas than hot dogs every day. If the restaurant makes 60 hot dogs every day, how many pizzas and hot dogs will it make in June?

First find the number of students who went through breakups: 1 / 4 * 180 = 45 students. Then subtract that number from the total number: 180 students - 45 students = 135 students. Then divide that number by 3 to find the number of students who didn't show up to take the test: 135 students / 3 = 45 students. Then subtract the number of students who failed in each way from the total number to find the number who passed: 180 students - 45 students - 45 students - 20 students = 70 students.
The answer: 70
Reverse engineering the question: There are 180 students in ninth grade. 1/4 of them bombed their finals because they were going through difficult breakups. 1/3rd of the rest didn't show up to take the test, and another 20 got less than a D. How many students passed their finals?

Janice walks up 3 flights of stairs 5 times per day, for a total of 3 * 5 = 15 flights of stairs. Janice walks down 3 flights of stairs 3 times per day, for a total of 3 * 3 = 9 flights of stairs. In total, she walks 15 + 9 = 24 flights of stairs in a single day.
The answer: 24
Reverse engineering the question:
Janice's office is on the third floor, and she has to walk up 3 flights of stairs to get to her office. In a single day, she goes up the three flights of stairs 5 times, down the the three flights of stairs 3 times, and uses the elevator the remainder of the time. How many flights of stairs does Janice walk (up and down) in a single day?