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Kazeer [188]
3 years ago
6

n 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?
Mathematics
1 answer:
mariarad [96]3 years ago
5 0
This is a tricky question because you might use the ratio and proportion method. However, there are 3 terms involved. To cut it down to 2, let's lump the profit rate. The solution is as follows:

10:5/2::8:x/3

Solving for x,
20/5 = 24/x
x = 24(5)/20 = 6

<em>Hence, it will earn 6 dirhams of profit.</em>
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