Question: What do you need to do for the mixture to thicken?
Options:
When the bag is placed inside the freezer bag full of ice, you need to place the bag in the freezer.
When the bag is placed inside the freezer bag full of ice, you need to shake the bag for 10 minutes.
Answer: When the bag is placed inside the freezer bag full of ice, you need to shake the bag for 10 minutes.