If eleven plus two equals one, what does nine plus five equal?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Which word does the below Plexor means ?

When it is alive we sing, when it is dead we clap our hands. What is it?

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?

What kind of tree can you carry in your hand?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What can go up a chimney down, but can’t go down a chimney up?