Maths Set Theory Puzzle

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?




Similar Riddles

The king of Octopuses has servants who have six, seven or eight legs. The distinguishing characteristics of the servants is that the one with seven legs always lie but the one with either six or eight legs speak the truth always.

One day, four servants meet and converse:

The black one says, 'We have 28 legs altogether.'

The green one says, 'We have 27 legs altogether.'

The yellow one says, 'We have 26 legs altogether.'

The red one says, 'We have 25 legs altogether.'


Can you identify the colour of the servant who is speaking the truth?

Servants with multiple legs

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Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
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Why Wine Glass Stem is so long?

Wine Glass

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In a kingdom, King George did not allow any citizen to visit the world outside. Also, only a person with proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check the every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter. How?

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Can you find out the missing number in the grid?

Missing Number

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Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

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what does the below rebus means?

Funny Love

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Can it be possible to build a house that has all its four walls facing towards the South?

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Remove two matchsticks to make the below equation correct.

Make the Equation Correct

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In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.