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?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

Can you solve below mathematical equation?

2^1234 - 2^1233

Solve below rebus puzzle?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Can you name an animal whose killing cannot be performed without spilling your own blood?