John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I have Rs.50 and I spend it in the way as below.

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

Can you write down eight eights so that they add up to one thousand?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

Name a key which is hardest to turn.

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?