Answer:
The American consumed
gallons of gasoline.
Explanation:
We are given the following information in the question:
Gasoline consumed by the Americans = 320,500,000 gallons
We have to convert this number into scientific notation.
- Scientific notation is a method of writing very large or very small numbers.
- A number is written in scientific notation when a number between 1 and 10 is multiplied by a power of 10.
The above number can be written in scientific notation in the following manner:

Hence, the American consumed
gallons of gasoline.