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Unit 5: Keep the unit constant

Ratios and sharing

Read this before the quizzes

A ratio is a count of parts

Compare like with like

Joining two ratios

Sharing

Two ratios

Units in a ratio

Answers and why: ratios and sharing

Change and proportion

When a ratio changes

Direct and inverse proportion

Variation and ages

A ratio that changes

Inverse proportion

Direct variation

Answers and why: change and proportion

Averages

An average is a total in disguise

Adding, removing, replacing

Averages of groups

A value joins

Two groups

A value leaves

Answers and why: averages

Mixtures and alligation

Mixing prices and strengths

Alligation: the cross method

Dilution and replacement

Price mixture

The cross method

Replacement

Answers and why: mixtures and alligation

Word problems, slips and formula cards

Four steps for any word problem

Ten slips to watch for

The formula cards

Your pace for this unit

Your mission

Groups with their own averages

Adding to a mixture

Answers and why: word problems and slips

Self-check: can you do it?

Ratio, proportion, averages and mixtures. This unit has one move: keep the unit constant.

Quantitative Aptitude Unit 5: Ratio, proportion, averages and mixtures

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