Table:
0
A
B
C
D
E
1
House name
House mascot
House colour
Year opened
House leader
2
Hillary
Yeti
Green
1980
Mrs Wong
3
Kupe
Kiwi
Yellow
1981
Mr Goodyer
4
Rutherford
Elephant
Red
1982
Mr Morrisson
5
Mansfield
'Dog' from Footrot Flats
Purple
1984
Mr Davidson
6
Te Kanawa
Taniwha
Blue
1987
Mr Norris
7
Batten
Buzzy Bee
White
1998
Ms Dorey
8
Snell
Black panther
Black
2001
Mr Mackenzie

Questions and formulas:
Question: What is the earliest year a house opened?
Formula: MIN(D1)
Formula2: MIN(D2:D8)
Level: easy
Question: How many house colours are associated with house names of Hillary?
Formula: ROWS(UNIQUE(FILTER(C1, A1="Hillary")))
Formula2: ROWS(UNIQUE(FILTER(C2:C8, A2:A8="Hillary")))
Level: medium
Question: What is the house colour associated with the house name of Kupe?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Kupe"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,A2:A8="Kupe"),3))
Level: medium
Question: How many house mascots are associated with yellow house colours?
Formula: ROWS(UNIQUE(FILTER(B1, C1="Yellow")))
Formula2: ROWS(UNIQUE(FILTER(B2:B8, C2:C8="Yellow")))
Level: medium