John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What building has the most stories?

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

How many triangles are there on the puzzle below?

Solve the following series:
AZ, GT, MN, __, YB

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?