arr = [7600, 5900, 1400]
seats = 37

total = 0.0

arr.each { |e| total += e }

puts "Total: #{total}"

s_d = total / seats
m_d = s_d

puts "SD: #{s_d}"
puts

loop do
  m_d -= 1 # Changed to 0.1 or lower if you get a divide by zero error

  sum = 0

  arr.each { |e| sum += (e / m_d).truncate}

  break if sum == seats
end

puts "MD: #{m_d}"
puts

puts "State\tPopulation\tQ\tLQ\tMQ\tApportionment"

arr.each do |v|
  s_q1 = v / s_d
  s_q2 = v / m_d

  puts "#{arr.index(v)}\t#{v}\t#{s_q1.truncate(3)}\t#{s_q1.truncate}\t#{s_q2.truncate(3)}\t#{s_q2.truncate}"
end

l_q_total = 0
arr.each { |e| l_q_total += (e / s_d).truncate}

app_total = 0
arr.each { |e| app_total += (e / m_d).truncate}

puts "Total\t#{total}\t#{seats}\t#{l_q_total}\t-\t#{app_total}"