number = Integer(ARGV.fetch(0))
divisor = Float(ARGV.fetch(1, 10.0))

raise 'Invalid divisor' unless divisor % 10 == 0

puts "#{number} - number"
puts "#{(Float(number) / divisor).round(0)}  - number divided by #{divisor}"
puts "#{(Float(number) / divisor).round(0) * Integer(divisor)} - " \
  "number divided by #{divisor}, multiplied by #{Integer(divisor)}"