1 m3 of seawater contains 0.0006 mg of gold. Determine the total gold reserve in the waters of the World Ocean (1370 million km3).

1) 1370 million km3 = 1.37 × 10 ^ 18 m3
2) Let’s make the proportion:
1 m3 – 0.0006 mg gold
1.37 × 10 ^ 18 m3 – X
X = 1.37 × 10 ^ 18 m3 × 6 × 10 ^ -4 mg: 1 m3 = 822 × 10 ^ 12 mg = 822 × 10 ^ 6 kg = 822 × 10 ^ 3 t = 822,000 t
Answer: The total gold reserve in the World Ocean is 822,000 tons.

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