Answer:
6th day
Step-by-step explanation:
Start with 11.25 cup.
Each morning and evening, you drink 1.5 cups + 0.42 cups = 1.92 cups
Divide 11.25 cups by 1.92 cups.
11.25/1.92 = 5.86 days
In 5 days (1 morning and 1 evening per day), you will have drunk 5 * 1.92 cups = 9.6 cups.
After 5 days, you have 11.25 cups - 9.6 cups = 1.65 cups
On day 6, you drink 1.5 cups in the morning, now you have 1.65 cups - 1.5 cups = 0.15 cups. You don't have enough for the evening amount of 0.42 cups since you only have 0.15 cups left.
After the morning of day 6, you only have 0.15 cups left. You drink 0.15 cups on the evening of day 6, and you run out.
Answer: On the sixth day of drinking.
