why number 8549176320 is one of a kind?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

What has a ring but no finger?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

Can you count the number of triangles inside a triangle?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

I am quite hot but become too cold if you remove the first two letters. What am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?