Case study·Standard multi-step (3/5)·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 housing society uses the three-bin system shown in the figure.
Total: 5 marks
(a) Which bin should receive vegetable peels? (1 mark)
(b) Which bin should receive metal cans? (1 mark)
(c) Why should button cells not be mixed with wet waste? (2 marks)
(d) Give one benefit of keeping dry recyclable waste clean. (1 mark)
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