Henry Ernest Dudeney/Puzzles and Curious Problems/359 - Queer Arithmetic
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Puzzles and Curious Problems by Henry Ernest Dudeney: $359$
- Queer Arithmetic
- Can you take away seven-tenths from five so that exactly four remains?
When Martin Gardner republished this puzzle in 536 Puzzles & Curious Problems in $1968$, he added the hint that the task should be accomplished "with matches".
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Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Unclassified Problems: $359$. -- Queer Arithmetic
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Match Puzzles: $509$. Queer Arithmetic