You can use
=SUM(Sheet2:Sheet3!B3)
to sume the values of B3 on multiple sheets, however, the condition
part will not work across worksheets. You may need to perform the
conditional check on the individual worksheets by placing the formula
IF(A3=150,+b3,0) in a blank cell and then use the formula above to sum
all of the cells that contain that formula.
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Excelenator
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