Question

2 bats could see out of the right eye. 3 bats could see out of the left eye. 4 could not see out of the left eye. 5 could not see out of the right eye. What is the least number of bats? What were their eye sites?

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Answer 1

3 bats could see out of the left eye, 4 bats could not: minimum 7 bats (3+4)
Eyesight could range. There could be 2 bats who can see perfectly, 1 bat who can only see out of it's left eye, and 4 who were blind as a bat (lol) or there could be 2 who could only see out of their right, 3 who could see out of their left, and 2 who couldn't see at all.