Table:
0
A
B
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F
1
District
Incumbent
Party
First elected
Result
Candidates
2
Pennsylvania 6
Hugh Scott
Republican
1946
Retired to run for U. S. Senate Democratic gain
Herman Toll (D) 55.4% Fred C. Gartner (R) 44.6%
3
Pennsylvania 9
Paul B. Dague
Republican
1946
Re-elected
Paul B. Dague (R) 61.9% James C. N. Paul (D) 38.1%
4
Pennsylvania 12
Ivor D. Fenton
Republican
1938
Re-elected
Ivor D. Fenton (R) 54.9% Charles E. Lotz (D) 45.1%
5
Pennsylvania 16
Walter M. Mumma
Republican
1950
Re-elected
Walter M. Mumma (R) 56.6% John H. Bream (D) 43.4%
6
Pennsylvania 17
Alvin Bush
Republican
1950
Re-elected
Alvin Bush (R) 56.0% C. Max Hess (D) 44.0%
7
Pennsylvania 22
John P. Saylor
Republican
1949
Re-elected
John P. Saylor (R) 57.0% Robert S. Glass (D) 43.0%

Questions and formulas:
Question: How many incumbents come from alvin bush's district?
Formula: ROWS(FILTER(F1,B1="Alvin Bush"))
Formula2: ROWS(FILTER(F2:F7,B2:B7="Alvin Bush"))
Level: easy