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

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You were playing ping pong with your friend. Suddenly the ball fell into a narrow metal pipe that was imbedded in the concrete surface of the floor one foot deep. Now you don't have any other ball and you desperately want to take it out and play. You and your friend have your shoelaces, your tennis paddle and a plastic water bottle. However, the bottle cannot fit into the pipe.

How will you take the ball out?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

What type of tree can I carry in my hand?

What always comes into a house through the keyhole?

What can you see in the middle of March and April that you can never see in any other month?

What does this rebus mean?

O
N
C
E
TIME

What shoe company does this rebus represent?