In the fold
I have taken a square piece of paper with an area equal to a two-figure number of square centimetres.
The corners are labelled A, B, C and D clockwise around the square. I have folded the square with one straight fold so that the corner A lies midway between C and D. I have then opened up the sheet and measured the length of the fold line. It is an even number of centimetres.
How long is it?
WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 14 March. The Editor’s decision is final. Please send entries to Enigma 1684, Â鶹´«Ã½, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
Answer to 1676 Pick and mix: a box of Tweets has 22 red sweets and eight green sweets
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The winner J. Bolton of Rugby, Warwickshire, UK
