Table:
0
A
B
C
D
E
1
District
Vacator
Reason for change
Successor
Date successor seated
2
North Carolina 7th
John Culpepper (F)
Seat declared vacant January 2, 1808
John Culpepper (F)
Seated February 23, 1808
3
New Jersey At-large
Ezra Darby (DR)
Died January 27, 1808
Adam Boyd (DR)
Seated March 8, 1808
4
Indiana Territory At-large
Benjamin Parke
Resigned March 1, 1808
Jesse B. Thomas
October 22, 1808
5
Pennsylvania 1st
Joseph Clay (DR)
Resigned March 28, 1808
Benjamin Say (DR)
Seated November 16, 1808
6
Massachusetts 2nd
Jacob Crowninshield (DR)
Died April 15, 1808
Joseph Story (DR)
Seated May 23, 1808
7
Rhode Island At-large
Nehemiah Knight (DR)
Died June 13, 1808
Richard Jackson, Jr. (F)
Seated November 11, 1808

Questions and formulas:
Question: How many vacators have October 22, 1808 as date successor seated?
Formula: ROWS(FILTER(B1,E1="October 22, 1808"))
Formula2: ROWS(FILTER(B2:B7,E2:E7="October 22, 1808"))
Level: easy
Question: What is the date successor seated where Massachusetts 2nd is the district?
Formula: FILTER(E1,A1="Massachusetts 2nd")
Formula2: FILTER(E2:E7,A2:A7="Massachusetts 2nd")
Level: easy
Question: Who is the successor when the reason for change is seat declared vacant January 2, 1808
Formula: FILTER(D1,C1="Seat declared vacant January 2, 1808")
Formula2: FILTER(D2:D7,C2:C7="Seat declared vacant January 2, 1808")
Level: easy
Question: Which district has John Culpepper (f) as the vacator?
Formula: FILTER(A1,B1="John Culpepper (F)")
Formula2: FILTER(A2:A7,B2:B7="John Culpepper (F)")
Level: easy