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The Guardian - UK

Science

Alex Bellos

Can you solve it? Can you outwit the wizards of Oz?

Jacinda Esther Simon

Dave Gray ArchiveSYDNEY, AUSTRALIA - FEBRUARY 17: An aerial view of the central business district (CBD) and Sydney Opera House on February 17, 2023 in Sydney, Australia. (Photo by David Gray/Getty Images)

Parabola, a wonderful Australian maths magazine for secondary school pupils, celebrates its 60th birthday this month. Today’s puzzles are taken from a recently published compilation of its best problems.

1. The question with no question

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