One of these options in G9 should do it:
1. Simplest: =SUM(G3*D3,G5*D5,G7*D7)
2. If intervening cells are blank: =SUMPRODUCT(D37,G3:G7)
3. If intervening cells need to be skipped:
=SUMPRODUCT(--(MOD(ROW(D37),2)=1)*D37*G3:G7)
Thanks Max. I actually figured it out just before your reply came through; I
did it with the first option you listed.
I have a much harder one I am trying to figure out now. I have figured out
the formula to get the sum from 31 sheets on to a summary
sheet at the end of the Excel book; EX: =SUM(1:31!J3:J8). However, I now need
to know how to do it with an exception. Ex: I need =SUM(1:31!P38) BUT ONLY
IF THE FIGURES IN P38 ARE POSITIVE.
Then I need, for another cell, =SUM(1:31!P38) BUT ONLY IF FIGURES IN P38
ARE NEGATIVE.