2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you write down eight eights so that they add up to one thousand?

Why is the Hole below a Lock?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

What does Alexander the Great and Winnie the Pooh have in common?

Can you replace the question mark with the correct number?

our enemy challenges you to play Russian Roulette with a 6-cylinder pistol (meaning it has room for 6 bullets). He puts 2 bullets into the gun in consecutive slots, and leaves the next four slots blank. He spins the barrel and hands you the gun. You point the gun at yourself and pull the trigger. It doesn't go off. Your enemy tells you that you need to pull the trigger one more time, and that you can choose to either spin the barrel at random, or not, before pulling the trigger again. Spinning the barrel will position the barrel in a random position.

Assuming you'd like to live, should you spin the barrel or not before pulling the trigger again?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?