By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

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)

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Find the missing number in the sequence.

3 5/3 7/5 11/7 ? 17/11

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

What does this say?

XLR8

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What number should come in place of the question mark below?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?