A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What has one letter and starts with an E?

What is the fastest way to double your money?

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?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Can you spot the hidden girl in the picture below?

What number when divided in half becomes zero?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle: