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4MA1/1FR Jun 2022, Question 14: Substitution

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1FR (Foundation) · Calculator · 5 marks

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The question, in short

Apply a cooking-time rule to a 2.6 kg chicken, then reverse the rule to find the weight of a chicken needing 2 hours 40 minutes.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 2 marks

Use the rule with weight 2.6 kg to find the cooking time in minutes.

  1. 12.6 × 40 = 104
  2. 2104 + 30 = 134

Answer134

Part (b) · 3 marks

Given a cooking time of 2 hours 40 minutes, work out the chicken's weight in kg.

  1. 12 × 60 + 40 = 160
  2. 2160 − 30 = 130
  3. 3130 ÷ 40 = 3.25

Answer3.25

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