Mathematics for IGCSE & O level - Ratio And Proportion (Section 6 - No. 40)
Which statements are true concerning ratios?
Ratios can be simplified.
Ratios must always compare parts to the whole.
Ratios can be expressed in different units, provided the units are consistent.
Ratios are often used for scaling and proportions.
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Ratios can be simplified, units must be consistent, and they are related to scaling.