A farmer owns 3 hectares of land. The average annual rainfall is 800 mm and the crop needs 600 mm of water per hectare. How many cubic metres of water are required for the crop in one year?
Answer
18 000
The correct answer is 18 000 — Multiply by 3 hectares: 6 000 m³ × 3 = 18 000 m³.
Step-by-step solution
- Convert water requirement per hectare from mm to metres: 600 mm = 0.6 m.
- Find the volume per hectare: 0.6 m × 10 000 m² = 6 000 m³.
- Multiply by 3 hectares: 6 000 m³ × 3 = 18 000 m³.
Common mistake: Forgetting to convert hectares to square metres.
Concept tested: Water requirement calculation
Published · How this solution was prepared and checked
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