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Can I read this "2:3" as "2 to ratio 3"
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anonymousCan I read this "2:3" as "2 to ratio 3"

No. You can read it as "two to three", but if in context it would not be clear that you mean a ratio, then you can say "a/the ratio of two to three".

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anonymous Can I read this "2:3" as "2 to ratio 3"

No. It depends on the context. If you are talking about the Bible, then the numbers indicate chapter and verse, for example, Matthew 2:3 means "The gospel according to Matthew, chapter 2, verse 3", in other words,

When Herod the king had heard these things, he was troubled, and all Jerusalem with him.

CJ