What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

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?

Why do we preferably have round manhole covers and not square ones?

Find the missing letter in the last circle logically in the given below picture.

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

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

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What does this rebus means ?

PROG WORKRESS

What is the centre of gravity?