What does it mean?

What is full of holes but still holds water?

Can you make four (4) nines (9) equal 100?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

why number 8549176320 is one of a kind?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Replace the question mark with the correct number in below Picture:

81 x 9 = 801. What must you do to make the this equation true?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.