Can you solve the below tricky visual equation?

What have one eye but still cannot see?

How many times in a given day, minutes and hour clock comes in a straight line ?

What is the fastest way to double your money?

What does this rebus mean?

O
N
C
E
TIME

Can you name four days which start with the letter 'T'?

what's the probability of getting a king or a queen from a pack of 52 cards?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

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?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?