Since the question does not specify if these are different bats or not, we can assume that at least 2 bats can see with both eyes = can see out of their left eye and out of their right eye. We will also assume that there is 1 bat who can see out of his left eye but not his right eye.
Then you'll have the following
2 bats = only see out of their right eye
3 bats = only see out of their left eye
1 bat = Right blinded
We have 3 bats so far.
We can also assume that 4 bats are fully blind.
That leaves us with:
2 bats = good right eye
3 bats = good left eye
5 bats = right blinded
4 bats = left blinded
Trying to rearrange the bats differently will always give out a larger number than 7.
The purpose of the Louisiana purchase in 1803 was to give the United States more control of the Mississippi River, and the port city of New Orleans, which were both used by farmers to ship their crops and get paid.
