I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

Find the next number in the sequence

5 12 24 36 ?

If your uncle’s sister is not your aunt, what relation is she to you?

Move four matchsticks to the below square to form three squares?

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?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?