Joe’s Pyramid
This is Joe’s pyramid. Every stone is marked with a different one or two digit positive number.
Where a stone rests on two others, its number is the sum of the numbers marked on the two stones on which it rests.
What number is X?
WIN 拢15 will be awarded to the sender of the first correct answer opened on Wednesday 2 March. The Editor’s decision is final. Please send entries to Enigma 1631, New 女生小视频, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
Answer to 1625 32,340
The winner N. Karunakaren, Toongabbie, New South Wales, Australia
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