Table:
0
A
B
C
D
E
1
Number on map
Name
Colour
Construction commenced
Population
2
1
Langley Green
Grey
1952
7,286
3
2
Northgate
Dark green
1951
4,407
4
3
Pound Hill
Orange
1953
14,716
5
4
Maidenbower
Blue
1987
8,070
6
5
Furnace Green
Light green
1960
5,734
7
6
Tilgate
Red
1955
6,198
8
7
Broadfield
Sky blue
1969
12,666
9
8
Bewbush
Light brown
1975
9,081
10
9
Ifield
Purple
1953
8,414
11
10
West Green
Dark blue
1949
4,404
12
11
Gossops Green
Maroon
1956
5,014
13
12
Southgate
Brown
1955
8,106
14
13
Three Bridges
Yellow
1952
5,648

Questions and formulas:
Question: What is the average number for Northgate which commenced its construction before 1951?
Formula: AVERAGE(FILTER(A1, (B1="northgate")*(D1<1951)))
Formula2: AVERAGE(FILTER(A2:A14, (B2:B14="northgate")*(D2:D14<1951)))
Level: easy
Question: What is the lowest population for the neighborhood with the color blue that commenced its construction before 1987?
Formula: MIN(FILTER(E1, (C1="blue")*(D1<1987)))
Formula2: MIN(FILTER(E2:E14, (C2:C14="blue")*(D2:D14<1987)))
Level: easy