What number do you get when you multiply all of the numbers on a telephone's number pad?

What has no start, end, or centre?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Take away the whole and some still remain. What is it?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

What number divided by 4 is the same as that number minus 4?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

What goes up but never comes down?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Move three sticks of the spiral below to form a square.