They are: 2 to 5, 6 to 15 and 8 to 20
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4:16
It could be that: 5 to 20 is equivalent 1 to 4
There are infinitely many equivalent ratios to 15:5, eg 12:4, 30:10, 45:15, 60:20 The simplest form of the ratio is 15:5 = (3×5):(1×5) = 3:1
equivalent fractions of 5/4 = 10/8, 15/12, 20/16
Ratios that are equal to each other can be 3/4=75/100 or 1/4=25/100