What is wrong in the below Picture?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

Prove that the below maths equation is true.

8 + 8 = 91

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?

Why do we preferably have round manhole covers and not square ones?

What does below Rebus say?

XLR8

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Which alphabet letter is a question?

How can you drop a raw egg from a height onto a concrete floor without cracking it?