1. If the price of a book was cut 20% for a sale, and the sale price was $16, what was the original price?

2. The concept of "nudge theory" in behavioral economics suggests that positive reinforcement and indirect suggestions can influence people's behavior and decision-making. This approach aims to alter people's behavior in a predictable way without forbidding any options or significantly changing their economic incentives. For example, placing healthier food options at eye level in a cafeteria can "nudge" people towards making healthier choices without removing less healthy options. What is the main principle behind nudge theory as described in this passage?

3. Five friends - Alex, Beth, Charlie, Dana, and Ethan - are standing in a line. Alex is not at the end of the line. Beth is between two people. Charlie is not next to Dana. Ethan is at one end. What is a possible order of the friends from left to right?

4. Select the word that is most nearly opposite in meaning to the given word: FRUGAL

5. What comes next in the sequence: 2, 5, 11, 23, 47, ...?

6. Five friends ran a race. Alex finished before Beth but after Charlie. Diana finished last, and Emma finished second. Who finished fifth?

7. Some books are novels. All novels are fiction. Therefore:

8. A study finds that cities with more green spaces have lower crime rates. Which of the following can be logically inferred?

9. If you're facing east and turn 270 degrees clockwise, which direction are you facing?

10. What is the value of tan(45°)?