MATHEMATICSUnderwater puzzle answers revealed to readersSolutions are now available to puzzles involving a fish in a tank.The GuardianPhoto: The Cosmonaut / CC BY-SA 2.5 ca, via Wikimedia CommonsShareXBlueskyFacebookLinkedInEmailCopy link▶ The World News podcastPro☆ SaveProContinue reading at The GuardianPublisher? Request removal