If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

What does the below rebus puzzle mean?

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.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What does this Rebus Picture mean?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

What does a man do only once in his lifetime, but women do once a year after they are 29?

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

What does this rebus riddle mean?