What word is represented by this rebus?

Imagine you are in a room with no windows or doors. How will you get out?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

What makes this number unique: 8,549,176,320?

What is the next number in this series?

4,12,84,3612....

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?

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

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

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