John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I am sure no one can have two things for dinner. what are they?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

What is the centre of gravity?