To be a little more precise, 0.5:1 is a reasonable format in which to state a

ratio (of certain types); and [tex]\dfrac{0.5}{1}[/tex] is a valid expression to write in the course of your work; but if you are asked to give an answer as a decimal, it would be 0.5 by itself, and if you are asked to give it as a simplified

fraction, it would be [tex]\frac{1}{2}[/tex], and so on. We don't generally give complex fractions as answers, because they are too ... well ... complex! Answers should be readable, and commonly in a standard form so that everyone will write it the same way. (That's partly for the teacher's benefit, and also so you can compare your answer with the back of the book.)

So there is nothing

*mathematically *wrong with any sort of expression, as long as it is valid; but it may be inappropriate in a particular context. That's why I want to know where you are using 0.5/1.

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