What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Remove two matchsticks to make the below equation correct.

What Adam and Eve do not have but the rest of the people have?

Can you start the fire using two pieces of wood?

Find the missing number in the image below.