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Edexcel IGCSE Math A 1.7 ratio and proportion

Use ratio-and-proportion questions to simplify ratios, share money, scale recipes and calculate unknown quantities from context.

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Foundation

Exam points

  • Simplify ratios from counts or tables and convert ratio parts into fractions of a total.
  • Share money or objects in two- and three-part ratios, then adjust the amounts.
  • Use scale factors in recipes, currencies or populations to calculate unknown quantities.

Covered syllabus points

1.7.A Ratio notation1.7.B Divide a quantity in a given ratio or ratios Share £4161.7.C The process of proportionality to evaluate unknown1.7.D Missing quantities in direct proportion1.7.E Word problems about ratio and proportion

1.7 Ratio and proportion question 1

[Maximum number: 2]

The pictogram gives information about the number of parcels a company posted on each of four days last week.

Table for Question 1.7 Ratio and proportion question 1 — Edexcel IGCSE Math A Foundation
Figure for Question 1.7 Ratio and proportion question 1 — Edexcel IGCSE Math A Foundation

Represents 16 parcels

Find the ratio
number of parcels posted on Monday : number of parcels posted on Thursday Give your answer in its simplest form.

1.7 Ratio and proportion question 2

[Maximum number: 7]

Jess makes salad dressing by mixing lemon juice and olive oil in the ratio 2: 5 by volume. She uses 0.5 litres of lemon juice.

Question (a)

(a)

Work out how much olive oil she uses to make the salad dressing.
litres

Tiesto wants to make 630 millilitres of the salad dressing. He mixes lemon juice and olive oil in the ratio 2: 5 by volume.

[ 2 ]

Question (b)

(b)

Work out how much olive oil he uses to make the salad dressing.
millilitres

Salad dressing is made by mixing lemon juice and olive oil in the ratio 2: 5 by volume.
The cost of lemon juice is $ 13.50 per litre.
The cost of olive oil is $ 18 per litre.

[ 2 ]

Question (c)

(c)

Work out the ratio
cost of lemon juice in the salad dressing : cost of olive oil in the salad dressing Give your ratio in its simplest form.

[ 3 ]
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