Table:
0
A
B
C
D
E
F
G
1
Week
Date
Opponent
Result
Game site
Record
Attendance
2
1
September 9, 1960
at Boston Patriots
W 13–10
Boston University Field
1–0
21,597
3
2
September 18, 1960
at Buffalo Bills
W 27–21
War Memorial Stadium
2–0
15,229
4
3
September 23, 1960
at New York Titans
L 24–28
Polo Grounds
2–1
20,462
5
4
October 2, 1960
Oakland Raiders
W 31–14
Bears Stadium
3–1
18,372
6
6
October 16, 1960
Los Angeles Chargers
L 19–23
Bears Stadium
3–2
19,141
7
7
October 23, 1960
Boston Patriots
W 31–24
Bears Stadium
4–2
12,683
8
8
October 30, 1960
Dallas Texans
L 14–17
Bears Stadium
4–3
13,002
9
9
November 6, 1960
Houston Oilers
L 25–45
Bears Stadium
4–4
14,489
10
10
November 13, 1960
at Dallas Texans
L 7–34
Cotton Bowl
4–5
21,000
11
11
November 20, 1960
at Houston Oilers
L 10–20
Jeppesen Stadium
4–6
20,778
12
12
November 27, 1960
Buffalo Bills
T 38–38
Bears Stadium
4–6–1
7,785
13
13
December 4, 1960
New York Titans
L 27–30
Bears Stadium
4–7–1
5,861
14
14
December 10, 1960
at Los Angeles Chargers
L 33–41
Los Angeles Memorial Coliseum
4–8–1
9,928
15
15
December 17, 1960
at Oakland Raiders
L 10–48
Candlestick Park
4–9–1
7,000

Questions and formulas:
Question: Which team was the opponent on week 15?
Formula: LET(query1,SUMMARIZE(C1,SUMX(A1)),FILTER(query1,CHOOSECOLS(query1,2)=15))
Formula2: LET(query1,SUMMARIZE(C2:C15,SUMX(A2:A15)),FILTER(query1,CHOOSECOLS(query1,2)=15))
Level: hard