Table:
0
A
B
C
D
1
college name
state
enrollment
2
LSU
LA
18000
3
ASU
AZ
12000
4
OU
OK
22000
5
FSU
FL
19000

Questions and formulas:
Question: What is the total enrollment number of all colleges?
Formula: SUMMARIZE(A1,SUMX(C1))
Formula2: SUMMARIZE(A2:A5,SUMX(C2:C5))
Level: easy
Question: What is the average enrollment number?
Formula: AVERAGE(C1)
Formula2: AVERAGE(C2:C5)
Level: easy
Question: How many colleges in total?
Formula: ROWS(UNIQUE(A1))
Formula2: ROWS(UNIQUE(A2:A5))
Level: easy
Question: How many different colleges are there?
Formula: ROWS(UNIQUE(A1))
Formula2: ROWS(UNIQUE(A2:A5))
Level: easy
Question: What is average enrollment of colleges in the state FL?
Formula: LET(query1,FILTER(A1:D1,B1="fl"),SUMMARIZE(CHOOSECOLS(query1,1),AVERAGEX(CHOOSECOLS(query1,3))))
Formula2: LET(query1,FILTER(A2:D5,B2:B5="fl"),SUMMARIZE(CHOOSECOLS(query1,1),AVERAGEX(CHOOSECOLS(query1,3))))
Level: hard
Question: List all information about college sorted by enrollment number in the ascending order.
Formula: SORT(SUMMARIZE(A1,SUMX(C1)), 2, 1)
Formula2: SORT(SUMMARIZE(A2:A5,SUMX(C2:C5)), 2, 1)
Level: medium
Question: List the  college names whose enrollment is greater 18000 sorted by the college name
Formula: SORT(UNIQUE(CHOOSECOLS(FILTER(A1:D1,C1>18000),1)), 1, 1)
Formula2: SORT(UNIQUE(CHOOSECOLS(FILTER(A2:D5,C2:C5>18000),1)), 1, 1)
Level: hard
Question: What are the names of schools with the top 3 largest size?
Formula: TAKE(SORT(SUMMARIZE(A1,SUMX(C1)), 2, -1), 3)
Formula2: TAKE(SORT(SUMMARIZE(A2:A5,SUMX(C2:C5)), 2, -1), 3)
Level: hard
Question: What are the names of the schools with the top 3 largest class sizes?
Formula: TAKE(SORT(SUMMARIZE(A1,SUMX(C1)), 2, -1), 3)
Formula2: TAKE(SORT(SUMMARIZE(A2:A5,SUMX(C2:C5)), 2, -1), 3)
Level: hard
Question: What is the name of school that has the smallest enrollment?
Formula: TAKE(SORT(SUMMARIZE(A1,SUMX(C1)), 2, 1), 1)
Formula2: TAKE(SORT(SUMMARIZE(A2:A5,SUMX(C2:C5)), 2, 1), 1)
Level: hard
Question: What are the states with colleges that have enrollments less than the some other college?
Formula: SUMMARIZE(HSTACK(B1,A1),SUMX(C1))
Formula2: SUMMARIZE(HSTACK(B2:B5,A2:A5),SUMX(C2:C5))
Level: medium
Question: average enrollment of florida colleges 
Formula: LET(query1,FILTER(A1:D1,B1="fl"),SUMMARIZE(CHOOSECOLS(query1,1),AVERAGEX(CHOOSECOLS(query1,3))))
Formula2: LET(query1,FILTER(A2:D5,B2:B5="fl"),SUMMARIZE(CHOOSECOLS(query1,1),AVERAGEX(CHOOSECOLS(query1,3))))
Level: hard
Question: Average enrollment 
Formula: AVERAGE(C1)
Formula2: AVERAGE(C2:C5)
Level: easy
Question: total number of colleges
Formula: ROWS(UNIQUE(A1))
Formula2: ROWS(UNIQUE(A2:A5))
Level: easy
Question: What's the total number of colleges? 
Formula: ROWS(UNIQUE(A1))
Formula2: ROWS(UNIQUE(A2:A5))
Level: easy
Question: Colleges with enrollment over 18000 in ascending order of names
Formula: SORT(UNIQUE(CHOOSECOLS(FILTER(A1:D1,C1>18000),1)), 1, 1)
Formula2: SORT(UNIQUE(CHOOSECOLS(FILTER(A2:D5,C2:C5>18000),1)), 1, 1)
Level: hard
Question: the smallest enrollment by college name and state.
Formula: SUMMARIZE(HSTACK(A1,B1),MINX(C1))
Formula2: SUMMARIZE(HSTACK(A2:A5,B2:B5),MINX(C2:C5))
Level: medium
Question: Ascending order of names for colleges enrolled more than 18000 students.
Formula: SORT(UNIQUE(CHOOSECOLS(FILTER(A1:D1,C1>18000),1)), 1, 1)
Formula2: SORT(UNIQUE(CHOOSECOLS(FILTER(A2:D5,C2:C5>18000),1)), 1, 1)
Level: hard
Question: the enrollment on average.
Formula: AVERAGE(C1)
Formula2: AVERAGE(C2:C5)
Level: easy
Question: the number of colleges
Formula: ROWS(UNIQUE(A1))
Formula2: ROWS(UNIQUE(A2:A5))
Level: easy
Question: How many colleges?
Formula: ROWS(UNIQUE(A1))
Formula2: ROWS(UNIQUE(A2:A5))
Level: easy
Question: the mean enrollment of colleges in fl.
Formula: LET(query1,FILTER(A1:D1,B1="fl"),SUMMARIZE(CHOOSECOLS(query1,1),AVERAGEX(CHOOSECOLS(query1,3))))
Formula2: LET(query1,FILTER(A2:D5,B2:B5="fl"),SUMMARIZE(CHOOSECOLS(query1,1),AVERAGEX(CHOOSECOLS(query1,3))))
Level: hard