Can you find the missing piece of the Porsche?

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

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

John was piloting a plane behind a car but was never able to overtake it. Why?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?