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Consider the numbers in the fraction: 
6 is 2 times 3 
The denominator 15 is 5 times 3 
Numerator : Denominator = 6 : 15 or 2 : 5 
If the Denominator is to be 20 it is 4 times 5, 
the Numerator has to be 4 times 2 
Answer: 
6/15 = 8/20

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