Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

what does this below rebus represent identXQQQQQME

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

What goes up but never comes down?

What is next number in the pattern below:

131 517 192 123 ?

It belongs to you, but other people use it more than you do. What is it?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

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