Table:
0
A
B
C
D
E
F
G
1
Source
Chrome
Internet Explorer
Firefox
Safari
Opera
Other
2
StatCounter
42.68%
25.44%
20.01%
8.39%
1.03%
2.44%
3
Clicky
38.92%
29.08%
21.22%
9.28%
1.17%
0.32%
4
W3Counter
32.60%
21.70%
19.50%
15.40%
2.20%
8.60%
5
NetApplications
16.00%
57.60%
18.88%
5.59%
1.53%
0.41%
6
Wikimedia
46.02%
20.47%
17.71%
3.10%
5.45%
7.25%

Questions and formulas:
Question: What percentage of users were using other browsers according to the source that reported 21.22% were using Firefox?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,D1="21.22%"),7))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,D2:D6="21.22%"),7))
Level: medium
Question: According to W3Counter, what percentage of browsers used Firefox?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,A1="w3counter"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,A2:A6="w3counter"),4))
Level: medium
Question: What percentage of users were using Firefox according to the source that reported 21.70% used Internet Explorer?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,C1="21.70%"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,C2:C6="21.70%"),4))
Level: medium
Question: Which source reported 32.60% of browsers used Chrome?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,B1="32.60%"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,B2:B6="32.60%"),1))
Level: medium
Question: What percentage of users were using Firefox according to the source that reported 15.40% used Safari?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,E1="15.40%"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,E2:E6="15.40%"),4))
Level: medium
Question: What percentage of users were using Internet Explorer according to the source that reported 20.01% used Firefox?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,D1="20.01%"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,D2:D6="20.01%"),3))
Level: medium