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Tao Nan 2025 P6 Maths Prelim — Paper 2 Q15 Solution

Paper 2 · Q15 · 3 marks · Data Analysis

Question

The average height of a group of 3 girls and 5 boys was 160 cm. The average height of the 3 girls was 12 cm less than the average height of the 5 boys. Find the average height of the 5 boys.
Answer: 164.5 cm

Worked solution

  1. Total height = $160 \times 8 = 1280$ cm. Let boys' average = $b$
  2. girls' average = $b - 12$. $5b + 3(b-12) = 1280$
  3. $8b - 36 = 1280$
  4. $8b = 1316$
  5. $b = 164.5$ cm.

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