I travel all around the world but always stay in the corner. What am I?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Can you identify if it's a murder or a suicide ?

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

Which is the smallest number that you can write using all the vowels exactly once?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?