If 1+9+8=1, what is 2+8+9?

I’m tall when I’m young, and I’m short when I’m old. What am I?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

What is black when you buy it, red when you use it, and gray when you throw it away?

10+10 and 11+11 can give you the same answer.

Explain how?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

Can you find out the remainder when 3^300 is divided by 5?

How many sides does a circle have?