A Basic info about the company:

Comptel Corporation is a global software corporation concentrating in telecommunications. Comptel was originated in Helsinki, Finland in 1986, the trade register entry was made on 30 June. Formerly, the corporation was a system development and IT subsidiary of Helsinki Telephone Association. Comptel found place on NASDAQ OMX Helsinki in 1999 under the code CTL1V.

The motive behind posting these Comptel Interview Puzzles is to help you shape your skills and making you much more confident while appearing in the interviews.

Difficulty Popularity

In a recreational activity, you are given four different jars of 2 liters, 4 liters, 6 liters and 8 liters respectively with an unlimited water supply. Then you are asked to measure exactly 5 liters of water using them.

How will you do it?

How will you do it?

Difficulty Popularity

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Difficulty Popularity

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

Difficulty Popularity

A couple had to take shelter in a hotel for they could not proceed their journey in the rain. Having nothing to do at all, they started playing cards. Suddenly there was a short circuit and the lights went off. The husband inverted the position of 15 cards in the deck (52 cards normal deck) and shuffled the deck.

Now he asked his wife to divide the deck into two different piles which may not be equal but both of them should have equal number of cards facing up. There was no source of light in the room and the wife was unable to see the cards.

For a certain amount of time, she thought and then divided the cards in two piles. To the husbandâ€™s astonishment, both of the piles had equal number of cards facing up.

How did she do it?

Now he asked his wife to divide the deck into two different piles which may not be equal but both of them should have equal number of cards facing up. There was no source of light in the room and the wife was unable to see the cards.

For a certain amount of time, she thought and then divided the cards in two piles. To the husbandâ€™s astonishment, both of the piles had equal number of cards facing up.

How did she do it?

Difficulty Popularity

A bank customer had Rs.100 in his account. He then made 6 withdrawals, totaling Rs.. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left

Rs.50 Rs.50

Rs.25 Rs.25

Rs.10 Rs.15

Rs.8 Rs.7

Rs.5 Rs.2

Rs.2 Rs.0

Rs.100 Rs.99

Why are the Totals not exactly right ?

Withdrawals Balance left

Rs.50 Rs.50

Rs.25 Rs.25

Rs.10 Rs.15

Rs.8 Rs.7

Rs.5 Rs.2

Rs.2 Rs.0

Rs.100 Rs.99

Why are the Totals not exactly right ?

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