Case study·Hard exam skill (4/5)·No calculator
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 town fair expects 20000 visitors in one day. The organisers must choose between single-use plastic plates, paper plates, or a washable steel-plate deposit system.
Total: 6 marks
(a) Which option best reduces waste at source? Justify briefly. (2 marks)
(b) Give one condition needed to make that option work safely. (1 mark)
(c) Why is merely switching from plastic plates to disposable paper plates not a complete solution? (2 marks)
(d) Suggest one supporting action for visitors that improves waste handling. (1 mark)
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