6 billion people - 300 million people x 23 barrels per captia = 6.9x10^9 or 6,900,000,000
300 million people divided by 23 barrels per capita divided by 6 billion people equals 6.9 x 10-9 or 6,900,000,000.
The total yearly use of petroleum in the United States is closest to 23 barrels per person, with the average American using roughly 23 barrels annually (Resources) A half-life of 710 million years is assigned to uranium-235. In the United States, finished motor gasoline accounted for an average of 8.03 million b/d (337 million gallons per day), or almost 44% of all petroleum consumption. The second-highest petroleum product consumed in the US is distillate fuel oil. Heating oil and diesel fuel are both distillate fuel oils.
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