Interview Riddles

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

Gold Chain Puzzle

A woman wants to buy something at an auction where you bid grams of gold instead of money. She owns a length of gold chain (with 2 ends) made of 23 interlocking loops, each weighing 1 gram.

She wants to go to a jeweler before the auction to cut the minimum number of loops that would allow her to pay any sum from 1 to 23. For example, she could pay a 13 gram price with a 12 link chain and a single link. After much thought, she figures out a way to do it by cutting just 2 of the loops in the chain.

How many loops are in the pieces of chains that she has after the 2 cuts?

Riddle Answer

Calendar Cubes

A man has two paper cubes on his desk. Every day he arranges both cubes so that the front faces show the current day of the month. What numbers are required on the faces of the cubes to allow this for all possible days in the calendar?

Riddle Answer

Clock Time

What is the first time after 3PM when the hour and minute hands of a clock are exactly on top of each other?

Riddle Answer

The Gong

Suppose a clock takes 7 seconds to strike 7. How long does it take for the same clock to strike 10?

Riddle Answer

Sum of Hats Puzzle

There are 3 people Abel, Bill and Clark. Three of them have numbers (positive integers) written on their hats. They can see the numbers on the other two hats but not their own. The number on one hat is the sum of the numbers on the other two hats. They are given this information and asked in turn if they can identify their number.

In the first round Abel, Bill and Clark each in turn say they don’t know. In the second round Abel is first to go and states his number is 50. What numbers are on Bill and Clark?

Riddle Answer

Interview Riddles

Gold Chain Puzzle

Calendar Cubes

Clock Time

The Gong

Sum of Hats Puzzle

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