Problem:
Counting the total number of values from the range A1:B3 on Sheets 1, 2 & 3 that are greater than the criteria specified in cell A2.
Solution:
Use the SUM, COUNTIF, and INDIRECT functions as shown in the following formula:
=SUM(COUNTIF(INDIRECT("Sheet"&{1,2,3}&"!A1:B3"),">"&A2))
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