Henry Ernest Dudeney/Puzzles and Curious Problems/147 - Blindness in Bats
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Puzzles and Curious Problems by Henry Ernest Dudeney: $147$
- Blindness in Bats
- A naturalist was investigating (in a tediously long story) whether bats are in fact actually blind.
- He discovered that blindness varied.
- Two of his bats could see out of the right eye,
- just three of them could see out of the left eye,
- four could not see out of the left eye,
- and five could not see out of the right eye.
- He wanted to know the smallest number of bats that he could have examined in order to get these results.
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Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Various Arithmetical and Algebraical Problems: $147$. -- Blindness in Bats
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Miscellaneous Puzzles: $219$. Blindness in Bats