It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

I am an odd number. Take away a letter and I become even. What number am I?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

If you say my name, I will no longer exist. What am I?

Solve the puzzle by telling what does below picture means.