exam Maths Puzzle Numerical Ability

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If there are 6 X 10to the 9th power people on the Earth and there is enough freshwater to provide each person with 8.79 X 10to the 5th power L, how much freshwater is on the Earth? Your business depreciates computers over a 5-year period. If a computer is purchased for $2150 this year and is expected to be worth only $600 at the end of the depreciation perio