How do you go from 98 to 720 using just one letter?

My sock drawer has 26 blue socks, 13 pink socks, 33 green socks, and 12 red socks, how many socks would I have to pull out in the dark to be sure I had a matching pair?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

If you say my name, I will no longer exist. What am I?

I have an eye but still cannot see.

Who am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What time is it when an elephant sits on a fence?