Since 1 kilometer is equal to 1000 meters, then 3 kilometers is 3 x 1000 = 3000 meters. Since an hour has 60 minutes, then 2 hours is equal to 2 x 60 = 120 minutes. Therefore, her speed is 3000 meters / 120 hours = 25 meters per minute.
The answer: 25
Reverse engineering the question: Jane runs 3 kilometers in two hours. What is her speed in meters per minute?

First find the total amount of paint Marla mixes by dividing the amount of blue paint by the percentage of the paint that's blue: 140 ounces / .7 = 200 ounces. Then multiply the total amount of paint by the percentage that's white to find the number of white ounces: 200 ounces * 10% = 20 ounces.
The answer: 20
Reverse engineering the question: Marla is mixing a particular shade of lilac that's 70% blue paint, 20% red paint, and the rest white paint. If she adds 140 ounces of blue paint, how many ounces of white paint does she add?

Five packages per box, with 250 sheets per package is 5 * 250 = 1250 sheets per box. Two boxes contain a total of 1250 * 2 = 2500 sheets. If each newspaper requires 25 pages, then with 2500 sheets she can print 2500 / 25 = 100 newspapers.
The answer: 100
Reverse engineering the question: Julie runs the school newspaper. In preparation for printing the next issue of The School News, she bought two boxes of standard paper, each containing 5 packages, with 250 sheets of paper per package. If this issue of The School News uses 25 sheets of paper to print one newspaper, how many newspapers can Julie print with the paper that she purchased?

Caleb was left with 40 - 3 - 3 - 5 - 2 = 27 dandelion puffs to give to his friends. They each received 27 / 3 = 9 dandelion puffs.
The answer: 9
Reverse engineering the question:
Caleb picked a handful of dandelion puffs. He gave 3 to his mom, another 3 to his sister, 5 to his grandmother, and 2 to his dog. Then, he divided the remaining dandelion puffs equally among his 3 friends. How many dandelion puffs did each friend receive if he originally picked 40 dandelion puffs?