It looks like a simple math sum but has left people scratching their heads... can you solve it?

It looks simple at first, but this math problem has the internet stumped. Don't be fooled - it demands more brainpower than ...

Study looks at how many steps a day may help you live longer

ABC News chief medical correspondent Dr. Jennifer Ashton "walks" through the research and shares why you may not need to take as many steps as you think for a healthy life.