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@items=Hash.new puts "please input the number of your courses:" course_number=gets puts "please input your score and the balance" puts "---------------------------------------" for i in 1..course_number.to_i puts "input your score:" score=gets puts "input its balance:" balance=gets @items[score]=balance end sum=0 total_credit=0 @items.each_pair do |key,value| sum=sum+key.to_i*value.to_i end @items.each_value { |value| total_credit=total_credit+value.to_i } result=sum/total_credit puts "-------------------" puts "your balance average score is #{result}"