Puzzle #42: The card conundrum
21 January 2020
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From New Scientist #3265, 18th January 2020 [link]
Carl scribbled down an equation that contained only numbers and the letter X on a scrap of paper and left it on a table:
Bob found the card and realised that this was just a straightforward algebra problem. “I’ve found the solution”, he announced a minute later, dropping the card back on the table and leaving the room. Amy overheard him, walked over and picked up the card. After a while she announced: “That’s strange, I’ve found two solutions”.
Even stranger, Amy’s solutions were both different to Bob’s.
What were the solutions that Bob and Amy found?