Guess the number of each of the supplied values necessary to get the desired total

gistfile1.txt

def self.guessing_game(values=[2.5,10.95,55.25],multi_sum=4,total_goal=79.65)
    results = nil
    total_amount = 0.0
    length = values.length

    ((multi_sum ** length) / (multi_sum)).times do |i|

      total = 0
      possible = []
      total_amount = 0.0.to_d # use decimal for accuracy
      length.times do |b|

        if total == multi_sum
          new_number = 1
        elsif b == (length - 1)
          new_number = (multi_sum) - total
        else
          last = (multi_sum) - total
          last = 1 if last < 1
          new_number =  Random.new.rand(0..(last - 1))
          new_number = 1 if new_number == 0
        end
        possible << new_number
        total += new_number
        total_amount += (values[b] * new_number.to_d)# use decimal for accuracy

      end
      puts "#{possible}"

      if total_amount == total_goal
        guessed = []
        values.each_with_index do |occurr,i|

          possible[i].times do
            guessed << occurr
          end

        end
        results = guessed
        break
      end
    end
    results
  end