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

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

How many times can you subtract the number two from the number fifty?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

What does below Rebus mean ?

esgg sgeg gegs gsge

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?

What has 88 keys?

Find the missing number in the image below.

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

A girl says this to her best friend: “I was born in 1955, and I celebrated my 17th birthday last weekend.” Her best friend thinks she’s lying, but she’s actually correct. How is that possible?