Table:
0
A
B
C
D
E
F
1
Country
Area (km²)
Population (millions, 2011)
GDP (PPP) (USD, per capita)
GDP (nominal) (billions USD)
HDI (2011)
2
Algeria
2,381,741
37.1
7200
183.4
0.698 (medium)
3
Libya
1,759,540
6.7
14100
177.9
0.760 (high)
4
Mauritania
1,025,520
3.4
2200
4
0.453 (low)
5
Morocco
710 850
32.3
5100
103.8
0.582 (medium)
6
Tunisia
163,610
10.7
9500
48.9
0.698 (high)

Questions and formulas:
Question: What is the population in millions for 2011 where the HDI for 2011 is 0.453 (low)?
Formula: SUMIFS(C1,F1,"0.453 (low)")
Formula2: SUMIFS(C2:C6,F2:F6,"0.453 (low)")
Level: easy
Question: What is the population in millions for 2011 where the GDP (nominal) (billions USD) is 4? 
Formula: SUM(FILTER(C1, E1=4))
Formula2: SUM(FILTER(C2:C6, E2:E6=4))
Level: easy
Question: What is the HDI for 2011 in Tunisia? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="Tunisia"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,A2:A6="Tunisia"),6))
Level: medium
Question: What is the area (km2) where the population in millions for 2011 is 37.1? 
Formula: LET(query1,SUMMARIZE(B1,SUMX(C1)),FILTER(query1,CHOOSECOLS(query1,2)=37.1))
Formula2: LET(query1,SUMMARIZE(B2:B6,SUMX(C2:C6)),FILTER(query1,CHOOSECOLS(query1,2)=37.1))
Level: hard
Question: What is the GDP (PPP) (USD, per capita) for Algeria? 
Formula: SUMIFS(D1,A1,"Algeria")
Formula2: SUMIFS(D2:D6,A2:A6,"Algeria")
Level: easy
Question: What is the GDP (nominal) (billions USD) where the population in millions for 2011 is 3.4? 
Formula: SUM(FILTER(E1, C1=3.4))
Formula2: SUM(FILTER(E2:E6, C2:C6=3.4))
Level: easy