QR CODES MATH RIDDLES

Els nens i nenes de Poland ens han enviat algunes postals amb enigmes matemàtics darrera d’un CODI QR. Com que potser no teniu l’aplicació mòvil, aquest és el problema que us proposen:

“Hello! There is a next question for you:
A fisherman was asked how long was the fish he had caught. He said:”It is 30 cm plus half its total lenght”.
How long is the fish?”

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