Cloth Roll to be Cut

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?




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10+10 and 11+11 can give you the same answer.

Explain how?

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There are six people in a family namely M, N, O, P, Q and R.

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N is the brother of Q's husband.
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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.
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Can you find out the next digit in the following series ?

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Based on similar logic, Can you prove that the below algebraic equation is true?
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How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

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