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 10^5L, how much freshwater is on the Earth?

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book Other Question

Find the nth number in the sequence 1, 5, 13, 25, 41 (x 2/3 y-3/4) 12/5 use the laws of exponents to simplify. write answers with positive exponents.