One day each of Neha's friends consumed some cold drink and some orange squash. Though the quanti- ties of cold drink and orange squash varied for the friends, the total consumption of the two liquids was exactly 9 litres for each friend. If Neha had one-ninth of the total cold drink consumed and one-eleventh of the total orange squash consumed. Find the ratio of the quantity of cold drink to that of orange squash consumed by neha on that day?