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

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

What does the below mathematical rebus mean?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

I make two people out of one. What am I?

Solve the following series:
AZ, GT, MN, __, YB

What does this rebus riddle mean?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

If 1+9+8=1, what is 2+8+9?

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?