Romeo has typical preferences over chocolates C and flowers F, with the associated utility function U (C, F) = 3CF + 10C + 6F. The price of chocolates is $5 per piece, and the price of flowers is $3 per stalk. He has $90 to spend on chocolates and flowers on Valentine's Day. Suppose his utility does not include any other goods. Fill in the blanks. At these prices, Romeo will purchase ___ pieces of chocolates and stalks of flowers. (Round to at least 2 decimal places.)