Table:
0
A
B
C
D
E
F
G
H
I
1
2009 general election
party
Manhattan
The Bronx
Brooklyn
Queens
Staten Island
Total
%
2
John C. Liu
Democratic
191,748
95,795
203,499
180,249
33,242
704533
72.2%
3
John C. Liu
Working Families Party
12,635
3,404
18,641
8,811
2,310
45801
4.7%
4
John C. Liu
Total
204,383
99,199
222,140
189,060
35,552
750334
76.9%
5
John C. Liu
Total
81.0%
83.7%
80.0%
73.5%
50.5%
750334
76.9%
6
Joseph A. Mendola
Republican
39,103
15,166
43,718
57,266
29,803
185056
19.0%
7
Joseph A. Mendola
Republican
15.5%
12.8%
15.7%
22.3%
42.3%
185056
19.0%
8
Stuart Avrick
Conservative
3,325
2,119
6,439
6,818
3,930
22631
2.3%
9
Stuart Avrick
Conservative
1.3%
1.8%
2.3%
2.7%
5.6%
22631
2.3%
10
Salim Ejaz
Rent Is Too High
3,614
1,569
3,422
2,607
691
11903
1.2%
11
John Clifton
Libertarian
2,022
525
1,946
1,488
389
6370
0.7%
12
Total Write-ins
Total Write-ins
15
7
20
14
10
66
0.01%

Questions and formulas:
Question: what percentage is brooklyn when manhattan is 15.5%?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,C1="15.5%"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I12,C2:C12="15.5%"),5))
Level: medium