What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What is the next number in the series?

15 29 56 108 208 ?

What has many teeth, but cannot bite?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

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

No matter how little or how much you use me, you change me every month. What am I?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

Sweet & very intelligent katty has 8 puppets(Jane Bird Barbie Angel Colleen Nora Lass Missy).
All puppets are of different size. She arrange all puppets to face towards the guest and tell the guess the following clues :

* Jane has three puppets bigger on its left side
* Bird has two puppets smaller on its left side
* Barbie has one puppet bigger on its right side
* Angel has two puppets smaller on its right side
* Colleen has one puppet bigger on its left side
* Nora has one puppet smaller on its left side
* Lass has four puppets bigger on its right side
* Missy has three puppets smaller on its right side

Also some puppets are inside the bigger puppets.

Assuming you are the guest , can you tell the katty how the puppets are arranged ?

Can you spot the hidden girl in the picture below?