What is common among 11, 69, and 88?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Can you find out the total number of triangles in the given figure?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

I look at you, you look at me I raise my right, you raise your left. What am I?

John was piloting a plane behind a car but was never able to overtake it. Why?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?