Can you write down eight eights so that they add up to one thousand?

What is next number in the pattern below:

131 517 192 123 ?

How can you make number one disappear by adding something to it?

What Adam and Eve do not have but the rest of the people have?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

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

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Which alphabet is a part of our body?

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?

If,

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

Then

4 / 5 = ?