sapsi wrote:
> Hello,
> I have a recipe for a cake which requires 100gm of flour and 100gms of
> butter and two 7" pans. If i change it to a 9" pan, do i
> a) multiply the weights of flour and butter by 9/7?
> or
> b) multiply by ratio of areas i.e multiply by 81/49 (9^2/7^2) ?

The latter will give you the same depth of layer.
And congratulations on doing the maths right!!
So many don't have a clue...

Dave