A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

In the image given, you can find several triangles. Can you count them all?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Which tank will fill first?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?