Maths help please

[xavier]

Can someone transpose the following formula for me so that I can find b when I know the values of a and c - thanks

(a-b) x 100 = c ___

b

another way of presenting that would be [(a/b)-1] x 100 (I think)

CHeers

xav

p.s. If anyone's interested we're trying to work out the moisture content when we know the original weight and the percentage mc :)

[Gerd Busker]

b = a / ( 1 + c/100 )

or

b = 100 x a / (c + 100)

G.

[Peter Twydell]

In article , xavier writes

Start by multiplying both sides by b, which gives:

(a-b) x 100 = bc

100a - 100b = bc 100a = bc + 100b 100a = b(c + 100) and finally 100a b = _______ c + 100

HTH

[xavier]

Thank you both. I am, as usual, astounding that anyone can get their heads around such things

Many thanks

Xav

[Peter Twydell]

In article , xavier writes

Glad to help.

Just simple algebra really, well before GCE level (when I were nobbut a lad). OTOH, I never could remember all the functions for integral calculus. Fortunately, DIY, PCs and work don't need that stuff, mainly geometry and the occasional trig function.

[mike ring]

[e-mail] (xavier) wrote in news: [e-mail]:

Oh, there's loads of very round heads here

mike

[xavier]

That's a very cavalier attitude to take....

[Peter Twydell]

In article , xavier writes

[The Natural Philosopher]

I am, as usual, astounded that they cannot.

[Bob Mannix]

Well, I guess one has to do something while waiting for the Aga to warm up again to cook after it has been turned off for overheating the house :o). OTOH I share your astoundment!