There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Move four matchsticks to the below square to form three squares?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Below rebus represent famous DiCaprio movie. Can you name it?

Replace the question mark with the correct number.

A sundial has the fewest moving parts of any timepiece. Which has the most?