Don,

It should work out something like this: (sg x vol) + (sg x vol) = new sg
x total vol.
That is, (1.050 x 5) + (1.000 x.5) = new sg x 5.5 That comes out to
5.75 = 5.5 x new sg or 1.045 = new sg

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Mike MTM, Cokesbury, New Jersey, USA