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?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

During which month do people sleep the least?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Can you identify the Oscar-winning movie from the rebus below?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?