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     EduGorilla 
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    A septic tank of volume 2 m3 serves for 20 people. Rate of accumulation of sludge is 30 litres per capita per year. If the tank is cleaned when it is filled 66% of its capacity. Then the cleaning period of the tank will be

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    1. 15 years
    2. 18 years
    3. 22 years
    4. 24 years
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