why number 8549176320 is one of a kind?

You bought me for dinner but never eat me. What am I?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

How many triangles can you count in the figure given?

What breaks yet never falls, and what falls yet never breaks?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Name a key which is hardest to turn.

In which direction should the missing arrow point?