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

Questions and formulas:
Question: How many houses are green?
Formula: ROWS(UNIQUE(FILTER(A1, E1="Green")))
Formula2: ROWS(UNIQUE(FILTER(A2:A6, E2:E6="Green")))
Level: medium
Question: What year was the house named gongola made?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Gongola"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="Gongola"),4))
Level: medium
Question: What is the name of the green house?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="Green"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="Green"),1))
Level: medium
Question: What is the green house made of?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="Green"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="Green"),2))
Level: medium
Question: What is the benue house made of?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Benue"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="Benue"),2))
Level: medium