How is the moon similar to a dollar?

What seven-letter word has hundreds of letters in it?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Which tank will fill first?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?