How many main rivers are in Australia?
7
2
3
2
3
2
3
2
4
3
2
4
3
2
4
3
5
2
4
3
5
2
4
3
5
2
4
1
3
5
2
4
6
1
3
5
2
4
6
1
3
5
2
4
6
1
3
5
2
7
4
6
8
1
3
5
2
7
4
6
8
1
3
5
2
7
4
6
8
1
3
5
2
9
7
4
6
8
1
3
5
2
9
7
4
6
8
1
3
5
2
9
7
4
6
8
1
3
5
2
9
7
4
12
6
8
1
3
5
2
9
7
4
12
6
8
1
3
5
9
7
4
12
6
8
1
5
9
7
4
12
6
8
1
10
5
9
ten
7
4
12
6
8
1
10
5
9
7
12
ten
6
8
1
0
10
5
9
13
7
12
6
8
1
10
ten
0
5
9
13
7
12
6
8
1
10
11
61
9
62
ten
0
13
7
12
6
8
1
10
11
9
61
13
7
12
62
6
8
1
0
14
10