Find the next number in the series below

21 32 54 87 131 ?

How many triangles can you count in the figure given?

What question can you never answer yes to?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

One evening there was a murder in the home of a married couple, their son and daughter. One of these four people murdered one of the others. One of the members of the family witnessed the crime.

The other one helped the murderer.

These are the things we know for sure:

1. The witness and the one who helped the murderer were not of the same sex.

2. The oldest person and the witness were not of the same sex.

3. The youngest person and the victim were not of the same sex.

4. The one who helped the murderer was older than the victim.

5. The father was the oldest member of the family.

6. The murderer was not the youngest member of the family.

Who was the murderer?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

How can one talk without saying a single word?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?