Find the next number in the series below

21 32 54 87 131 ?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

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

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

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

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?