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**1. The problem statement, all variables and given/known data**

If one truck runs on 6000 barrels of oil per year, how many trucks could run on the oil produced in the US in one year (1.9*10^10 barrels)?

**2. Relevant equations**

(6000 barrels/year) used by one truck

(1.9*10^10 barrels/year) for US production

**3. The attempt at a solution**

I simply divided 1.9*10^10 by 6000 to get 3,000,000.

I'm confused about the fact that 3,000,000 is not in units of "trucks". How can I set up this problem properly to include trucks as my units?