3/5 is the same as 12/20 because they are equivalent fractions.
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20/12 = 5/3
3*4 is 12 so $5 * 4 is $20. It's like a proportion. So, 12 books would cost $20.
3/5
12/20=6/10=3/5 Do you see the pattern?
If you cross-multiply and you obtain an equality, then the proportion is true. Example: 2/3 = 20/30 ? cross-multiply; 2 x 30 = 3 x 20 ? 60 = 60 Since we have an equality, the proportion is true.