Final answer:
The ratio of Americans killed to Americans injured in motor vehicle crashes can be calculated by dividing the number of Americans killed by the number of Americans injured.
Step-by-step explanation:
The ratio of Americans killed to Americans injured in motor vehicle crashes can be calculated by dividing the number of Americans killed by the number of Americans injured. The information provided does not specify the exact numbers for each category, so it is not possible to determine the exact ratio. However, if we have the number of Americans killed and the number of Americans injured, we can divide the two to find the ratio.