Question

A carton of milk contains 2.5L. If Zoe drinks 250ml twice a day, for how many days will the bottle last? The answer is 5 days but how? Please help

Answer 1

The main thing you need to know for this question is this conversion:

1 L = 1000 mL   ,   or 1 liter is equal to 1000 milliliters.

So, let's make the entire problem into milliliters:
The carton of milk has 2,500 mL, and Zoe drinks 500 mL a day (250 twice a day).

To find the number of days the bottle will last, you divide the total amount of milk by the amount she drinks per day:

2,500 / 500 = 5 days