Prove that twice of ten is the same as twice of eleven.

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

What part of the chicken has the most feathers?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

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?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?