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Ratios and proportion

Ratios and parts

Proportion and changing ratios

Speed and work

Distance, rate, time and average speed

Working together

Mixtures and units

Mixtures and weighted averages

Units and formulas

Check yourself

Before you try the quizzes

Check: ratios and parts

Check: inverse proportion

Check: average speed

Check: working together

Check: mixtures

Check: converting units

Answers and why

Foundations Unit 4 of the Prepspire GMAT Course: Rates, ratios, work and mixtures.

Share amounts in a ratio, scale with proportion, handle speed and average speed, add work rates, blend mixtures and convert units without a calculator.

Unit 4: Rates, ratios, work and mixtures

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