Parents across the globe have been left baffled by a seriously difficult homework question.

The tricky brain teaser was shared on Facebook, proving that even brainy grown-ups can be flummoxed. It came to wide attention after a perplexed mum uploaded an image of her son’s puzzling assignment online, asking for help from other users as they were “stuck”.

The teaser sparked widespread bemusement among numerous parents, as the tricky schoolwork involved unscrambling letters to form two Y3/Y4…