Case study·Hard exam skill (4/5)·No calculatorNeeds mentor review
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A dietician mixes two foods A and B. Food A and B provide protein and vitamin units as shown. At least protein units and at least vitamin units are required. Let and be the units of foods A and B.
Total: 4 marks
(a) Write the two nutrient constraints. (1 mark)
(b) Write the cost function to be minimized. (1 mark)
(c) Using relevant corner points , find the minimum cost. (2 marks)
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