one litter is 1000 milliliters
if each friend wants 400 milliliters, and there are ten friends, samantha needs 4000 milliliters of lemonade
since each pitcher can hold 2 liters, or 2000 milliliters, she’ll need to refill it 2 times
this is because 4000/2000 is 2
final answer: 2 times
hope this helped!!