what is the answer the this iready question?

Answer:
last option shown, 500 milliliters
Step-by-step explanation:
She has approx 3.5 liters of choc milk as shown in the pic.
3.5 liters x 1000 = 3500 milliliters total choc milk.
=3500/7 containers = 500 milliliters in each.
So pick the last option, 500 milliliters.