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

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

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.

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What does this rebus mean?

O
N
C
E
TIME

A bomb exploded in a room full of married couples and no one died. How?

Optical Illusion: A cat is hiding in plain sight in the backyard. Only the most observant eyes can spot the cat in 7 seconds. Can you? Test your eye power now!

Find three whole, positive numbers that have the same answer when multiplied together as when added together.