Correna,
=SUMPRODUCT((DensityChart!A1:A5000=B3)*(DensityCha rt!B1:B5000=B4)*(DensityChart!D1:D5000))
As you change your values in B3 and B4, the formula will automatically
look for those new values.
If this is the same question I answered on your other "unanswered"
post, you had indicated the solution worked.
Steve
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