135 kg of sugar are added to 600 litres of water and stirred until thoroughly mixed. The process operator then checks the batch to determine its Brix using a hand-held refractometer whihc is an instrument especially designed for this task. Calculate the Brix of the solution. Express your answer to the nearest tenth of a degree Brix. Do not include the degree sign in your answer. The density of water is one gram per millilitre which is equivalent to one kilogram per litre