Table:
0
A
B
C
D
E
1
House Name
Composition
Named after
Founded
Colours
2
Benue
Coed
River Benue
1973
Yellow
3
Gongola
Coed
Gongola River
1980
Purple
4
Niger
Coed
River Niger
1973
Green
5
Rima
Coed
Rima River
1980
Brown
6
Ogun
Coed
Ogun River
1980
Blue
7
Cross
Coed
Cross River
1976
Red

Questions and formulas:
Question: How many benue houses have been founded?
Formula: ROWS(UNIQUE(FILTER(D1, A1="benue")))
Formula2: ROWS(UNIQUE(FILTER(D2:D7, A2:A7="benue")))
Level: medium
Question: When is the earliest year founded for houses named after the river benue?
Formula: MINIFS(D1,C1,"river benue")
Formula2: MINIFS(D2:D7,C2:C7,"river benue")
Level: easy
Question: What composition was founded in 1976?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=1976),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,D2:D7=1976),2))
Level: medium
Question: What colours have a House Name of ogun?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="ogun"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,A2:A7="ogun"),5))
Level: medium