Birth Probability Puzzle

James and Catherine are a married couple. They have two children, one of the child is a boy. Assume that the probability of each gender is 1/2.
What is the probability that the other child is also a boy?

338 Cows and Goats Puzzle

There are 338 cows and goats in a farm. 2/3 of the cows are equal to 1/5 of the goats in the farm.
How many cows are there in the farm?

A Shop Selling 3 Chocolates for Re. 1 Puzzle

A Shop was selling 3 chocolates for Re. 1 and if you return three wrappers you get one free. If so, how many chocolates can you get for Rs. 45 ?

Lateral Thinking Riddle

On a windy rainy night , I was driving in my car. When i reach the bus stand , i see three people waiting for the bus.

1. An old lady who needs an immediate medical attention
2. My Best Friend
3. Girl whom i love from childhood

My car is a two seater, so can you tell me , what i have done in this situation ?

IAS Interview Puzzle : Priya’s father is Arun !

Priya’s father is Arun. Then Arun is the ________ of Priya’s father.

100 Coins Puzzle

You have a 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. You can't feel, see or in any other way find out which side is up. Split the coins into two piles such that there are the same number of heads in each pile.

10 Cigaratte Butts Puzzle

Bruce is an inmate in a large prison, and like most of the other prisoners, he smokes cigarettes. During his time in the prison, Bruce finds that if he has 3 cigarette butts, he can cram them together and turn them into 1 full cigarette. Whenever he smokes a cigarette, it turns into a cigarette butt.
One day, Bruce is in his cell talking to one of his cellmates, Steve.
"I really want to smoke 5 cigarettes today, but all I have are these 10 cigarette butts," Bruce tells Steve. "I'm not sure that will be enough."
"Why don't you borrow some of Tom's cigarette butts?" asks Steve, pointing over to a small pile of cigarette butts on the bed of their third cellmate, Tom, who is out for the day on a community service project.
"I can't," Bruce says. "Tom always counts exactly how many cigarette butts are in his pile, and he'd probably kill me if he notices that I had taken any."
However, after thinking for a while, Bruce figures out a way that he can smoke 5 cigarettes without angering Tom. What is his plan?