Table:
0
A
B
C
D
E
1
Type of sign
Shape
Border
Background colour
Text/Symbol
2
Warning
Triangular
Red
Yellow
Black
3
Prohibition
Circular
Red
Yellow
Black
4
Mandatory instructions
Circular
White
Blue
White
5
Supplementary
Rectangular
White Red
Blue Yellow
White Black
6
Directions, sometimes
Rectangular
Black
Yellow
Black
7
Information
Rectangular
White
Blue
White

Questions and formulas:
Question: Which sign has a red border and a warning sign?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(C1="red")*(A1="warning")),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(C2:C7="red")*(A2:A7="warning")),5))
Level: medium
Question: Which sign had a yellow background and a triangular shape?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="yellow")*(B1="triangular")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(D2:D7="yellow")*(B2:B7="triangular")),3))
Level: medium
Question: Which sign has a red border?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="red"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,C2:C7="red"),5))
Level: medium
Question: Which color is the background of the mandatory instructions?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="mandatory instructions"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,A2:A7="mandatory instructions"),4))
Level: medium
Question: What is the color of the background of the white border and sign of information?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(C1="white")*(A1="information")),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(C2:C7="white")*(A2:A7="information")),4))
Level: medium