oops!!..then I guess that says a lot about me too!!!...lol.
Melody, yes, I certainly do understand what you are saying. Well, looking at this it certainly calculates to the correct answer. I kind of understand the principle behind this which was to take the first scenario and devide that by the 2nd scenario, making sure the unknown is at the bottom, meaning this:
\({7 \over10}:{3 \over3}:{12 \over x}\)
Then multiply the X out and put that equal to the rest. Multiply the top row and devide by the product of the bottom row.
anycase, I know you know what I'm saying, so it's not like I have to explain this to you..(sorry)..uhm, I think to really test this out would be to create a few different scenarious and try to calculate the unknown using this approach.
Thanx for being out there!!