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?




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In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

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Can you tell me , Which other pages won't be there as well ?

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Maths Riddle

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In a classic wine shop, the list of three most popular wines are:
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John entered the wine shop and he needs to buy
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John has only 10000$. How many wine bottles of each type, John must buy?

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: Amazon offers a 10% discount over and over again.
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If the original cost of the iPhone is Rs.70,000 Which is the best offer for you?

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.