What is always in front of you but can’t be seen?

Replace the question mark with the correct number below.

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

Can you solve the maths in the below-given picture equation?

What is the next number in this series?

4,12,84,3612....

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

Find the last number in the series below:

voN luJ yaM raM ---

Why are all black people so quick ?

The more it dries, the wetter it becomes. Can you tell what it is?

Solve the following series:
AZ, GT, MN, __, YB