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For an electrical transformer the ratio of the coils on each side is the same as the ratio for the voltage change.
The number in the question is not a ratio it is simply a number. A ratio is a number compared to another number.
The ratio of three squares to five circles can be expressed as 3:5. This means for every three squares, there are five circles. The ratio shows the relative quantities of the two shapes compared to each other.
One way to do it is to look at each of the three as a part of the total. So you can consider the ratio 2:3:7 as the first thing being 2/12 of the total, the second being 3/12 and the third being 7/12.
Two to one, with the larger segment being towards the vertices of the triangle.