Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

What does this Rebus Picture mean?

What's a single-digit number with no value?

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

A girl rode into a tourist spot out of the city on Thursday. She loved the place and decided to stay for a few days. She stayed for four days and then she left for back home on Thursday.

How can this be possible?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

When 99 is considered higher than 100?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?