Before Mount Everest was discovered, what was the highest mountain in the world?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

I am white when I am dirty, and black when I am clean. What am I?

A man dies of old age on his 25 birthday. How is this possible?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

What is the word or phrase?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?