book Maths Puzzle Numerical Ability

If there are 6 x 10^9 people on the Earth and there is enough freshwater to provide each person with 8.79 x 10^5 L, how much freshwater is on the Earth?

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book Other Question

three consecutive integers are such that the first plus one half the second plus seven less than twice the third is 2101. What are the integers please show me the work on this problem

8x^2+33x+4= ????