thanks,
it's always the easy things that seem to give me most trouble to work out,
there's me trying all sorts of different combinations of division,multiplication,square roots etc to find a reason for the difference in numbers,
when all i had to do was add a couple together.
well that's 3 weeks in a row i've gotten the answer first, so next week think i'll wait till near the end of it, to give someone else more time to solve one of tomks puzzles, i'd hate to see no-one else joining in to try and solve them just because i have nothing else to do but spend my time trying to solve them.