If each of the 1.2 billion people in india uses 20 litres of water per day how many cubic metres of water are used per day by the indian population?

Answer

20 liters = 20000 mL

1 mL = 1 cm^3

1 cm^3 * (1 m / 100 cm) ^3 = 1 * 10^(-6) m
or one cubic centimeter is one one-millionth of a cubic meter

so, 20000 cm^3 per Person per Day * (1*10^(-6)m/1 cm^3) *1.2*10^9 People total
= 0.02 m^3 per Person per Day * 1,200,000,000 People = 24,000,000 m^3 per Day


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