Interview Riddles

Interview riddles are famous questions asked during interviews by some big companies like Google, Microsoft, Intel etc.

Red and Blue Marbles

Your friend has 100 red marbles, 100 blue marbles and 2 jars.

He proposes a game. He fills the jars with the marbles, put the two jars behind his back and tell you to pick one of them at random. You’ll then close your eyes, he’ll hand you the jar you picked, and you’ll pick a random marble from that jar.

You win if the marble you pick is blue, and you lose otherwise.

To give you the best shot at winning, your friend gives you the two jars before the game starts and says you can move the marbles around however you’d like, as long as all 200 marbles are in one of the 2 jars (that is, you can’t throw any marbles away).

How should you move the marbles around to give yourself the best chance of picking a blue marble?

Riddle Answer

Clock Strike 12

At six o’clock the wall clock struck 6 times. Checking with my watch, I noticed that the time between the first and last strokes was 30 seconds. How long will the clock take to strike 12 at midnight?

Riddle Answer

Three Mothers at the Movies

Three mothers each have their own daughter. They decide to go to the cinema with all of their daughters.

When they reached the cinema however, the ticket booth tells them that there are only five seats left for the show. The mothers, however, buy the tickets, and find a seat for everybody.

How is this possible?

Riddle Answer

Russian Gangster

A Russian gangster kidnaps you. He puts two bullets in consecutive order in an empty six-round revolver, spins it, points it at your head and shoots.

*Click* You’re still alive!

He then asks you, “Do you want me to spin it again and fire or pull the trigger again right away?” Which option will give you a higher probability of not being shot at?

Riddle Answer

Paying the Troll Toll

You are on your way to visit your Grandma, who lives at the end of the valley. It’s her anniversary, and you want to give her the cakes you’ve made. Between your house and her house, you have to cross 5 bridges, and as it goes in the land of make believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake.

How many cakes do you have to leave home with to make sure that you arrive at Grandma’s with exactly 2 cakes?

Riddle Answer

Interview Riddles

Red and Blue Marbles

Clock Strike 12

Three Mothers at the Movies

Russian Gangster

Paying the Troll Toll

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