My answer was correct- Dustsheet. Not always aware of the workings out yet can get the right answer anyhow. No need for being nasty puzzleRus - now be kind for the rest of the day please. What you give comes back to you- so give out goodness please. Pekoe, ignore the nitpickers. I gave the right answer and squarbear gave you the correct workings. All brains work differently yet some people choose to be kind with their words whereas others would rather be overly critical + look down their noses at others like an intellectual snob which is very sad. Pekoe, always choose to be kind :-)