A tricky maths puzzle that only 10% of people can solve has left people scratching their heads online - but it actually has an easy solution. Can you work it out?

The host asked: "What is the next number that completes this sequence? 4, 2, 3, 4, 6, 4, 9, 4, ?" Content cannot be displayed without consent People had 30 seconds to answer the puzzle – so be ...