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An old brainteaser by the Central Asian scholar Biruni (973−1048): If 10 dirhams (a unit of currency) earn 5 dirhams of profit in 2 months, how much profit will 8 dirhams earn in 3 months?
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An old brainteaser by the Central Asian scholar Biruni (973−1048): If 10 dirhams (a unit of currency) earn 5 dirhams of profit in 2 months, how much profit will 8 dirhams earn in 3 months?

User Rohan West
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2 Answers

3 votes
27 Dirhams is how much 8 Dirhams would make in 3 months.
User Ollegn
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5 votes

6 dirhams is the profit it will make.

User Oddmar Dam
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7.9k points
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