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Biggest Cities compared to Urban Population within 1,000 km

Let 'A' be the population of a city. Let 'B' be the sum of the populations of cities with at least 50,000 inhabitants that are no further than 1,000 km. When is A/B as high as possible?
You are shown A/B (as a percentage) and the population of the city in millions
Only cities with at least 500,000 inhabitants are possible candidates
The 'urban population' consists of the sum of the populations of cities with at least 50,000 inhabitants
Data taken from MaxMind
Quiz by scambigol
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Last updated: August 28, 2015
First submittedAugust 28, 2015
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Rank
%
Pop (m)
CITY
1
95%
1.45
Perth
2
56%
1.60
Manaus
3
53%
7.65
Lima
4
46%
2.59
Mogadishu
5
44%
3.43
Cape Town
6
41%
7.79
Kinshasa
7
38%
1.39
Antananarivo
8
36%
4.39
Sydney
9
35%
31.48
Tokyo
10
34%
3.73
Melbourne
11
31%
10.44
Manila
12
27%
2.70
Dakar
13
27%
2.81
Omdurman
14
27%
4.84
Santiago
15
24%
2.76
Addis Ababa
Rank
%
Pop (m)
CITY
16
23%
1.51
Ürümqi
17
23%
1.84
Brisbane
18
22%
1.84
Vancouver
19
20%
7.73
Cairo
20
20%
2.70
Dar es Salaam
21
19%
2.78
Luanda
22
19%
1.07
Adelaide
23
19%
8.72
Mexico City
24
18%
8.11
New York
25
17%
7.10
Bogotá
26
17%
10.38
Moscow
27
16%
1.41
Belém
28
16%
0.84
Ulaanbaatar
29
16%
3.47
Riyadh
30
16%
8.54
Jakarta
+1
level 77
Aug 28, 2015
Wikipedia: "Auckland has a population of 1,413,700, which constitutes 31 percent of the country's population." And no other country is within 1000 km.
+1
level 71
Aug 28, 2015
Thanks - on a similar quiz I recently did, Auckland has the same problem and this was pointed out to me. In the data I used, Auckland is "divided" in 3 or more cities, so this is why it doesn't appear. I'm sure what you're saying is correct, there's probably many other mistakes, too, but I'll just stick to the data as it is since I wouldn't be able to find and fix all mistakes anyway