switch_on_count.txt

total_switches = [*1..100]
switches = {}
total_switches.each { |n| switches[n] = false }

total_switches.each do |key|
  total_switches.each { |k, _v| switches[k] = !switches[k] if k%key == 0 }
end

switches_on = switches.select{ |_k,v| v }.count

puts " Total no. of switches with ON status #{switches_on}"