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?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

Why is the Hole below a Lock?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

If eleven plus two equals one, what does nine plus five equal?

What is the end of everything?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?