For which problem would working backwards be a productive problem-solving strategy?
Choose 1 answer
A. What is the maximum number of regions into which a circle can be cut using four lines?
B. Which is greater, the sum of the squares of the first five whole numbers, or the square of the sum of the first five whole numbers?
C. A group of friends decided to rent a vacation home for a week. They each paid $70 towards the rent. If three more friends had joined them, the cost per person would have been reduced by $14. How many friends went on the trip?
D. A person set up a stand to sell corn. The person's friend bought half of the ears. Then one customer bought 12 of the remaining ears. Finally, another customer bought 2/3 of the remaining ears. There were now six ears of corn left. How many ears of corn did the person start out with?