What is the fastest way to double your money?

Solve the mathematical equation in the picture below.

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

I travel all around the world but always stay in the corner. What am I?

Which is the smallest number that you can write using all the vowels exactly once?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you find a five letter word that is left with only two letters if one is removed?

What kind of band never plays music?