Unlisted Phone Number

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?




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Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

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Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

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Asked by Neha on 26 Dec 2020


A Shopkeeper sold a few chickens to four different customers on a particular day. It was such that each customer purchased half of the remaining chickens and half the chicken more.

Can you find out how many chicken were sold by the shopkeeper on that day if we tell you that the fourth customer bought a single chicken ?

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In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

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I cry without having a voice.
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I organized a small get together at my home.
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As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

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Gambling

In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.