Prove that the below maths equation is true.

8 + 8 = 91

What is the centre of gravity?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

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"

No matter how little or how much you use me, you change me every month. What am I?

What work can one never finish?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?