That, for every two of something, there is one of something else. For example, if the ratio of men to women at my party is 2:1, there are two men for every one woman.
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It refers to two quantities, the first of which is half the second. Equivalently, the second is double the first.
1/2
A ratio of 6:2 could be simplified to 3:1.
1:2
There are 2 triangles in a square so the ratio to square and triangle is 2 to 1
1:2 1540 is two times 770, so the ratio 770:1540 is simplified as 1:2