Five construction workers—Alex, Ben, Clara, Dan, and Eva—are tasked with working in five different zones, numbered 1 to 5, at a site. Each worker is assigned to one unique zone, and their assignments follow these rules.

You have been tasked with discovering the hidden password to a computer. The password is a single word. Luckily, the owner of the computer had just eaten chocolate before using it, so marks have been left on the keys. The password is 7 letters long and can also work backwards. What is the password?

You have 8 identical-looking balls, but one of them is slightly heavier than the others. You are given a balance scale, and you can only use it twice. How can you determine which ball is the heavier one?

You are tasked with opening a high-security safe. The safe has three dials, each with the numbers 1 to 9. A digital assistant gives you clues about the correct combination:

You have been tasked with cracking the code to a safe. The first four characters are shown, and you need to determine the final symbol to complete the password. Which symbol is correct?