Which number should replace the question mark?

Make a sentence consisting of three words that have the whole alphabet.

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

How many times do a clock's hands overlap in a day ?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

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