ink worth $100 per barrel will be mixed with 30 barrels of ink woth $60 per barrel to get a…

ink worth $100 per barrel will be mixed with 30 barrels of ink woth $60 per barrel to get a…

ink worth $100 per barrel will be mixed with 30 barrels of ink woth $60 per barrel to get a mixture worth $75 per barrel. how many barrels of $100 ink should be used?