N3.3 Solve problems involving ratio and proportion, including the unitary method of solution.
Candidates should be able to:
use ratio and proportion to solve word problems using informal strategies or using the unitary method of solution
solve best buy problems using informal strategies or using the unitary method of solution
use direct proportion to solve geometrical problems
use ratios to solve geometrical problems
Notes
Candidates should note that division in a given ratio is assessed in Unit 2 only.
Examples
Cola is sold in two sizes: 330ml cans or 1.5 litre bottles. A pack of 24 cans costs £4.99; a pack of 12 bottles costs £14.29. Which pack is best value for money?