If eleven plus two equals one, what does nine plus five equal?

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?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

If a wheel has 54 spokes, how many spaces are there between the spokes?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

How many triangles are there on the puzzle below?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?