Difficulty understanding "def large_neighbors", in 04

[CodeNameNosal]

I'm having trouble understanding what is needed to satisfy the following query:

"Some countries have populations more than three times that of any of their
neighbors (in the same continent). Give the countries and continents."

RSpec is asking for

expect(large_neighbors).to contain_exactly(
  ["Brazil", "South America"],
  ["China", "Asia-Pacific"],
  ["India", "South Asia"]
)

I feel that

SELECT name, continent FROM countries first 
  WHERE population > 3 * (SELECT avg(population)
  FROM countries second where first.continent = second.continent
  GROUP BY continent);

should satisfy this answer.

The output is as follows:

             name             |   continent
------------------------------+---------------
 Brazil                       | South America
 China                        | Asia-Pacific
 Cuba                         | Americas
 Democratic Republic of Congo | Africa
 Egypt                        | Middle East
 Ethiopia                     | Africa
 France                       | Europe
 Germany                      | Europe
 Guatemala                    | Americas
 India                        | South Asia
 Indonesia                    | Asia-Pacific
 Iran                         | Middle East
 Italy                        | Europe
 Nigeria                      | Africa
 Russia                       | Europe
 South Africa                 | Africa
 Turkey                       | Europe
 United Kingdom               | Europe
(18 rows)

For instance,
select population from countries where name = 'Turkey'; (73300000)
is higher than the average of other European countries:
select 3 * avg(population) from countries where continent = 'Europe'; (17404680.851063829787)