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Maths Puzzle Practice Set 2

• 1 / 57

How many times can you subtract 10 from 100?

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• 2 / 57

# Misogynist country

In a country in which people only want boys, every family continues to have children until they have a boy. If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country?

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• 3 / 57

You and your friend are caught by gangsters and made to play a game to determine if you should live or die. The game is simple.

There is a deck of cards and you both have to choose a card. You can look at each otherâ€™s cards but not at the card you have chosen. You both will survive if both are correct in guessing the card they have chosen. Otherwise, both die.

What is the probability of you surviving if you and your friend play the game optimally?

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• 4 / 57

Robin and Williams are playing a game. An unbiased coin is tossed repeatedly. Robin wins as soon as the sequence of tosses HHT appears. Williams wins as soon as the sequence of tosses HTH appears. The game ends when one of them wins. What are the probabilities of winning for each player?

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• 5 / 57

# A square triangle ?????????

This is a problem for our older puzzlers.

It may seem very peculiar to you but I've just drawn
a triangle where all the angles are square.
No, I don't mean right angles or 90
0
- that's
impossible!

What I do mean is that each angle, measured in degrees, is a square number.

Can you tell me how many degrees each of the angles is?

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• 6 / 57

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.

Now all your friends have one apple each, yet there is an apple remaining in the basket.

How?

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• 7 / 57

There were 200 Fishes in an aquarium, 99% of which were red. How many red fishes must be removed to make the percentage of red fishes 98%?

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• 8 / 57

Here is a list showing the month and a number for each month.

January 713
February 823
March 531
April 542
May 351
June 462
July 471
August 683

Decode the logic and find the number for September =?

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• 9 / 57

There are 338 cows and goats on a farm. 2/3 of the cows are equal to 1/5 of the goats in the farm. How many cows are there in the farm?

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• 10 / 57

A Shop was selling 3 chocolates for Re. 1 and if you return three wrappers you get one free. If so, how many chocolates can you get for Rs. 45 ?

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