ruby_girls.rb

ruby_girls = ['Ellen', 'Nadia', 'Yannis', 'Romina']
p ruby_girls[1]

ruby_girls.sort.each do |ruby_girl|
  puts ruby_girl
end

p 'let reverse it!'
ruby_girls.reverse.each do |ruby_girl|
  puts ruby_girl
end

ellen = {age: 17, height: 170}

nadia = {age: 18, height: 168}

rails_girls = [ellen, nadia]

total_height = 0
rails_girls.each { |rg| total_height += rg[:height] }
p total_height
average_height = total_height / rails_girls.size
p average_height