Which is the smallest number that you can write using all the vowels exactly once?

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

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Which point will the car reach to go out?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Can you divide the below-given shape into four equal and identical pieces?