Table:
0
A
B
C
D
E
F
G
H
I
1
Rnd
Date
Race Name
Length
Track
Location
Type
Pole Position
Winning Driver
2
1
March 18
Jimmy Bryan 150
mi (km)
Phoenix International Raceway
Avondale , Arizona
Oval
Danny Ongais
Gordon Johncock
3
2
March 26
Datsun Twin 200
mi (km)
Ontario Motor Speedway
Ontario , California
Oval
Tom Sneva
Danny Ongais
4
3
April 15
Coors 200
mi (km)
Texas World Speedway
College Station , Texas
Oval
Danny Ongais
Danny Ongais
5
4
April 23
Gabriel 200
mi (km)
Trenton International Speedway
Trenton , New Jersey
Oval
Tom Sneva
Gordon Johncock
6
5
May 28
International 500 Mile Sweepstakes
mi (km)
Indianapolis Motor Speedway
Speedway , Indiana
Oval
Tom Sneva
Al Unser
7
6
June 11
Molson Diamond Indy
mi (km)
Mosport Park
Bowmanville , Canada
Road course
Danny Ongais
Danny Ongais
8
7
June 18
Rex Mays Classic
mi (km)
Wisconsin State Fair Park Speedway
West Allis , Wisconsin
Oval
Danny Ongais
Rick Mears
9
8
June 25
Schaefer 500
mi (km)
Pocono International Raceway
Long Pond , Pennsylvania
Oval
Danny Ongais
Al Unser
10
9
July 16
Norton Twin 200
mi (km)
Michigan International Speedway
Brooklyn , Michigan
Oval
Tom Sneva
Johnny Rutherford
11
10
July 23
Gould Twin Dixie
mi (km)
Atlanta International Raceway
Hampton , Georgia
Oval
Tom Sneva
Rick Mears
12
11
August 6
Texas Grand Prix
mi (km)
Texas World Speedway
College Station , Texas
Oval
Tom Sneva
A. J. Foyt
13
12
August 20
Tony Bettenhausen 200
mi (km)
Wisconsin State Fair Park Speedway
West Allis , Wisconsin
Oval
Danny Ongais
Danny Ongais
14
13
September 3
California 500
mi (km)
Ontario Motor Speedway
Ontario , California
Oval
Tom Sneva
Al Unser
15
14
September 16
Gould Grand Prix
mi (km)
Michigan International Speedway
Brooklyn , Michigan
Oval
Johnny Rutherford
Danny Ongais
16
15
September 23
Machinist Union 150
mi (km)
Trenton International Speedway
Trenton , New Jersey
Oval
A. J. Foyt
Mario Andretti
17
16
October 1
Daily Empress Indy Silverstone
mi (km)
Silverstone Circuit
Silverstone , United Kingdom
Road course
Danny Ongais
A. J. Foyt
18
17
October 7
Daily Mail Indy Trophy
mi (km)
Brands Hatch (Indy Circuit)
Fawkham , United Kingdom
Road course
Al Unser
Rick Mears

Questions and formulas:
Question: How many races took place on October 1?
Formula: ROWS(UNIQUE(FILTER(C1, B1="October 1")))
Formula2: ROWS(UNIQUE(FILTER(C2:C18, B2:B18="October 1")))
Level: medium
Question: How many types of tracks are there on the Phoenix International raceway?
Formula: ROWS(UNIQUE(FILTER(G1, E1="Phoenix International Raceway")))
Formula2: ROWS(UNIQUE(FILTER(G2:G18, E2:E18="Phoenix International Raceway")))
Level: medium
Question: Daily Empress Indy Silverstone took place on which round?
Formula: MAXIFS(A1,C1,"Daily Empress Indy Silverstone")
Formula2: MAXIFS(A2:A18,C2:C18,"Daily Empress Indy Silverstone")
Level: easy
Question: How many races took place on the Indianapolis Motor Speedway track?
Formula: ROWS(UNIQUE(FILTER(C1, E1="Indianapolis Motor Speedway")))
Formula2: ROWS(UNIQUE(FILTER(C2:C18, E2:E18="Indianapolis Motor Speedway")))
Level: medium