In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

What will you call your mother's brother's brother-in-law?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

There is a place where if I stand up straight, I will still be considered sideways.

Complete the table series riddle by finding the number that can replace "??".

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What is common among 11, 69, and 88?

What is the fastest way to double your money?