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

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

By what process could you make a 'Tea-Table' into food?

What is the fastest way to double your money?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

A monk has a very specific ritual for climbing up the steps to the temple. First, he climbs up to the middle step and meditates for 1 minute. Then he climbs up 8 steps and faces east until he hears a bird singing. Then he walks down 12 steps and picks up a pebble. He takes one step up and tosses the pebble over his left shoulder. Now, he walks up the remaining steps three at a time which only takes him 9 paces. How many steps are there?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?