During the summer after your first year at Carnegie Mellon, you are lucky enough to get a job making coffee at Starbucks, but you tell your parents and friends that you have secured a lucrative position as a "java engineer." An eccentric chemistry professor (not mentioning any names) stops in every day and orders 250ml of Sumatran coffee at precisely 65.0°C. You then need to add enough milk at 5.00°C to drop the temperature of the coffee, initially at 85.0°C, to the ordered temperature.