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. How to write these ratios $X:Y:Z$ in terms of fraction i.e. either like $$\frac{\frac{X}{Y}}{Z}$$ or $$\frac{X}{\frac{Y}{Z}}$$?

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1 Answer

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When writing that the ratio of three groups is X:Y:Z, it means that:

The first group size is $$\frac{X}{X+Y+Z}$$ of the total.

The second group size is: $$\frac{Y}{X+Y+Z}$$ of the total.

And the third group size is: $$\frac{Z}{X+Y+Z}$$ of the total.

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