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Saturday, April 19, 2014

Candle burn puzzle with solution pdf || Interview puzzles with answers


Hi friends today you are going to learn some important and interesting math puzzles which you may face during interview. Different software organizations like CTS, TCS, Wipro, IBM, Infosys ask math puzzles in interview. In this tutorial you will get complete explanation of these math puzzles. These math puzzles are also very interesting for the math lovers. Hope you enjoy these math puzzles. If you like these puzzles, please don’t forget to share with others.

Interview math puzzles

1.       How can you make 120 with 5 zeros?

Answer: If you have studied science in class 12 then this question is very easy to you and you know how to do this. But I have to give that answer for them who don’t know how to do this.
This can be done using factorial formula.
Factorial {Factorial (0) + Factorial (0) + Factorial (0) + Factorial (0) + Factorial (0)}
= Factorial {1+1+1+1+1}
= Factorial (5)
= 5*4*3*2*1
= 120

2.       Suppose you have two identical candles each burns for 1 hour. How can you measure 90 minutes with these two candles without using any measuring tools?

Answer:  If you are a math expert and want to solve this alone. Please don’t read this answer now. When you figured out the answer then come and justify your answer.
           As you have two identical candles first light one end of a candle which burns for 60 minutes i.e. for 1 hour. When it burns out light both ends of the second candle which burns for 30 minutes.
1st candle (60 minutes) + 2nd candle (30 minutes) = 90 minutes

3.       Suppose you have two identical candles each burns for 1 hour. How can you measure 45 minutes with these two candles without using any measuring tools?

Answer:  First light both side of one candle and one side of another candle. The candle which is lighted at both ends, which if burns out will give you 30 minutes time duration. Then light another end of the second candle which now burns out in 15 minutes.

1st candle (30 minutes) + 2nd candle (15 minutes) = 45 minutes




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