Table:
0
A
B
C
D
E
F
1
Country
Region
Joined OPEC
Population (July 2012)
Area (km²)
Production ( bbl /day)
2
Algeria
Africa
1969
37367226
2381740
2,125,000 (16th)
3
Angola
Africa
2007
18056072
1246700
1,948,000 (17th)
4
Iraq
Middle East
1960
31129225
437072
3,200,000 (12th)
5
Kuwait
Middle East
1960
2646314
17820
2,494,000 (10th)
6
Libya
Africa
1962
5613380
1759540
2,210,000 (15th)
7
Nigeria
Africa
1971
170123740
923768
2,211,000 (14th)
8
Qatar
Middle East
1961
1951591
11437
1,213,000 (21st)
9
Saudi Arabia
Middle East
1960
26534504
2149690
8,800,000 (1st)
10
United Arab Emirates
Middle East
1967
5314317
83600
2,798,000 (8th)
11
Venezuela
South America
1960
28047938
912050
2,472,000 (11th)

Questions and formulas:
Question: When did the country that produced 1,213,000 (21st) bbl/day join Opec?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="1,213,000 (21st)"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F11,F2:F11="1,213,000 (21st)"),3))
Level: medium
Question: What was the minimum area in square kilometers that produced 3,200,000 (12th) bbl/day?
Formula: MINIFS(E1,F1,"3,200,000 (12th)")
Formula2: MINIFS(E2:E11,F2:F11,"3,200,000 (12th)")
Level: easy
Question: What is the highest poplulation in July 2012 in the country with an area of 2149690 square kilometers?
Formula: MAX(FILTER(D1, E1=2149690))
Formula2: MAX(FILTER(D2:D11, E2:E11=2149690))
Level: easy
Question: Which regions had a production (bbl/day) of 1,213,000 (21st)?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="1,213,000 (21st)"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F11,F2:F11="1,213,000 (21st)"),2))
Level: medium
Question: Which country had a production (bbl/day) of 2,494,000 (10th)?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="2,494,000 (10th)"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F11,F2:F11="2,494,000 (10th)"),1))
Level: medium