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

Keyboard words are not in alphabetical order, Why?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.