Milk left = $60 * (1 - 6/60)^2 = 60 * (0.9)^2 = 60 * 0.81 = 48.6$ litres.
बचा हुआ दूध = $60 * (1 - 6/60)^2 = 60 * (0.9)^2 = 60 * 0.81 = 48.6$ लीटर।