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Septic tanks are suitable for hospitals, isolated buildings or a cluster of how many houses?

A40 to 50
B1 to 2
C10 to 20
D4 to 5
Answer & Solution
Correct answer: D. 4 to 5
1. They suit places without sewerage. 2. A cluster of 4 to 5 houses can share one. 3. Chemical toilets and composting pits are alternatives. _Source: syllabus Science, Chapter 18, Wastewater Story._
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