It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A bomb exploded in a room full of married couples and no one died. How?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

what does this below rebus represent identXQQQQQME

What is always in front of you but can’t be seen?

Which alphabet letter is a question?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Be active and find the killer in the picture Riddle below.