Sum a range of cells using certain criteria in Excel

I want to total a range of cells given certain criteria that would identify the first cell in the range to total and XX number of cells afterwards.  For instance, In the attached file I am looking to total C25 through C49.  (B7 is a user defined date and B8 is the number of cells to be summed.

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Bill GoldenExecutive Managing MemberAsked:
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Rgonzo1971Commented:
No Attachment
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Rgonzo1971Commented:
Maybe this will help

=SUM(INDIRECT(ADDRESS(11+MATCH(B7,A12:A63,0),3)&":"&ADDRESS(11+MATCH(B7,A12:A63,0)+B8-1,3)))

Regards
EE2041119.xlsx
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Bill GoldenExecutive Managing MemberAuthor Commented:
Regardless of where I place your formula, it returns #N/A, except for cells A11..A14.  
Obviously I have lost something in translation.
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Rgonzo1971Commented:
Without your attachement it is difficult to know what you want
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Bill GoldenExecutive Managing MemberAuthor Commented:
I am sorry.  I thought I uploaded the spreadsheet with my original post.  It is attached.  Your formula appears in cell B9.
Decline-Curve-Calc.xls
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Rgonzo1971Commented:
then pls try

=SUM(INDIRECT(ADDRESS(14+MATCH(B7,B15:B87,0),3)&":"&ADDRESS(14+MATCH(B7,B15:B87,0)+B8-1,3)))
Decline-Curve-CalcV1.xls
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Rgonzo1971Commented:
shorter version

=SUM(OFFSET(INDIRECT(ADDRESS(14+MATCH(B7,B15:B87,0),3)),0,0,B8,1))
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Bill GoldenExecutive Managing MemberAuthor Commented:
Excellent solution.  Thanks.
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