Which is the smallest number that you can write using all the vowels exactly once?

Can you replace the question mark with the correct number?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

What has no start, end, or centre?

I have teeth but i don't bite. Who Am I ?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Count the number of triangles in the below picture?

I know a nine-letter word having only one vowel.
Do you ?