Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What does the below mathematical rebus mean?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?