Sharing in a ratio, direct and inverse proportion, compound measures (speed, density, pressure) and best-value problems.
Ratio compares quantities; proportion relates how they change together.
Working with ratio
- Simplify ratios by dividing by the HCF.
- Share in a ratio: add the parts to find the number of shares, divide the total by the number of shares to find one part, then multiply.
- Convert a ratio to a fraction of the total or to the form when comparing.
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