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

Make a sentence consisting of three words that have the whole alphabet.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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

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?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

Can you identify the hidden rebus in the image below?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

You can hear me, but you can't touch or see me.

What am I?