Find the missing letter in the last circle logically in the given below picture.

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

I can write cow in 13 letters.

Can You?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

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?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Count the squares in the matchstick puzzle below?