How many countries in South America have a population greater than 20 million?
6
1
1
3
1
3
1
3
2
1
4
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
6
1
4
5
3
2
6
1
4
5
3
7
2
6
1
4
5
3
7
2
6
1
4
5
3
7
2
6
4
5
3
7
2
6
4
5
7
2
6
4
5
7
2
6
9
4
5
7
6
8
9
5
7
6
8
9
7
6
8
9
7
6
8
9
10
7
11
6
8
9
10
7
11
6
8
9
10
7
11
6
8
9
10
7
11
6
8
9
10
7
11
6
8
9
13
12
10
7
11
6
8
9
13
12
10
7
11
6
8
9
13
12
10
7
11
6
8
9
13
14
12
10
7
11
8
9
14
128
128
128
128
2 countries
3 countries