This is the total, not the average.
PRIMARY 5 · MATHEMATICS
Average
Top 5 mistakes
Ranked by how often they appear across 42 MOE-aligned practice questions in our archive.
Confused the new average (20 kg) with the answer to the question.
Confused the original average (24 kg) with the heaviest box itself.
Computed the total mass of the remaining 5 boxes (5 × 20 = 100 kg) and gave that as the heaviest box mass, confusing total with a single value.
Divided total by 5 instead of 4 days.
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