Final answer:
Mr. Stanley ordered 746 drinks of juice and 1,397 drinks of water in May.
Step-by-step explanation:
To find how many drinks Mr. Stanley ordered in May, we need to set up equations based on the information given. Let's assume he ordered x drinks of juice and y drinks of water in May. Since the quantity of juice and water ordered in June is the same as May, we can set up the following equations:
x = 835 (quantity of juice ordered in June)
y = 1478 (quantity of water ordered in June)
Therefore, the answer is a. 746 drinks of juice and 1,397 drinks of water were ordered in May.