Table:
0
A
B
C
D
E
1
Casino
Opening Date
Theme
Hotel Rooms
Section of Atlantic City
2
Atlantic Club
December 12, 1980
Beach Resort
809
Downbeach
3
Bally's ᴮ
December 29, 1979
Modern
1,749
Midtown
4
Borgata
July 2, 2003
Tuscany
2,767
Marina
5
Caesars
June 26, 1979
Roman Empire
1,141
Midtown
6
Golden Nugget
June 19, 1985
Gold Rush Era
727
Marina
7
Harrah's
November 27, 1980
Marina Waterfront
2,590
Marina
8
Resorts
May 28, 1978
Roaring Twenties
942
Uptown
9
Revel
April 2, 2012
Oceanfront
1,399
Uptown
10
Showboat
April 2, 1987
Mardi Gras
1,329
Uptown
11
Tropicana
November 26, 1981
Old Havana
2,078
Downbeach
12
Trump Plaza ᴬ
May 26, 1984
Luxury Resort
906
Midtown
13
Taj Mahal
April 2, 1990
Taj Mahal
2,010
Uptown

Questions and formulas:
Question: When did the hotel with 727 rooms open?
Formula: LET(query1,SUMMARIZE(B1,SUMX(D1)),FILTER(query1,CHOOSECOLS(query1,2)=727))
Formula2: LET(query1,SUMMARIZE(B2:B13,SUMX(D2:D13)),FILTER(query1,CHOOSECOLS(query1,2)=727))
Level: hard