My round
A group of friends and I each had a half-pint of shandy (beer mixed with lemonade), but the proportion of lemonade to beer varied from glass to glass. Overall, I had a certain whole-number percentage of the lemonade used in the round of drinks, and a certain whole-number percentage of the beer. The percentage of beer was 5 more than that of the lemonade.
If I now told you the actual percentages it would be possible to work out how many of us there were in the group.
Knowing that, if instead I now told you how many of us there were, you could work out the percentages.
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How many of us were there, and what percentage of the lemonade did I have?
WIN 拢15 will be awarded to the sender of the first correct answer opened on Wednesday 18 November. The Editor鈥檚 decision is final. Please send entries to Enigma 1567, New 杏吧原创, Lacon House, 84 Theobald鈥檚 Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
Answer to 1561 Some check!: The checksum is 1
The winner Erik Aronesty of Durham, North Carolina, US