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  4. Find the people in your database whose ages are between 20 and 40
require 'csv'
people = CSV.read('text.txt')
young_people = people.find_all do |p|
  p[3].to_i.between?(20, 40)
end
puts young_people.inspect
//File: text.txt
F,M,M,45
L,C,F,23
D,P,F,38