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

If two's company, and three's a crowd, then whats four and five ?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Can you make four (4) nines (9) equal 100?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

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