Enigma 212: More or less right
6 August 2014
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From New Scientist #1358, 19th May 1983 [link]
I displayed a three-figure number on my calculator. My son looked at the calculator upside-down and said:
“I can see a three-figure number too, and it’s less than yours”.
I added 12 to my number.
“I can still see a number, again less than yours”, he said.
I multiplied my latest number by 6.
“More this time”, he said.
Finally I added 11.
“LESS”, he said, much to my surprise, and then we both laughed.
What number did I originally display?