Answer:
Samantha fill the pitcher 2 times.
Explanation:
As given
Samantha is using a 2-liter pitcher to serve lemonade to 10 of her friends.
As 1 litre = 1000 millilitre
Now convert 2 litre into millilitre.
2 litre = 2 × 1000 millilitre
= 2000 millilitre .
Thus Samantha is using a 2000 millilitre pitcher to serve lemonade to 10 of her friends.
As given
Samantha server each friend 400 milliters of lemonade .
Total amount of lemonade serve to 10 friends = 400 × 10
= 4000 millilitre
Let us assume that the number of times Samantha fill the pitcher be x.
Than the equation becomes
x × 2000 = 4000

x = 2
Therefore Samantha fill the pitcher 2 times.