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

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Which is heavier: a ton of bricks or a ton of feathers?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

Can you solve the rebus below?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What's the best place to go shopping in the ocean?