How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Can you move 2 matchsticks to form four equal sized squares.

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What you cannot hold but it is yours?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

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?

There are forty elephants and they have forty-fore heads. How can this be possible?