Pierre can make 3 liters of chocolate sauce from 450 grams of chocolate.
Step-by-step explanation:
Given, 
Chocolate used to make 200 ml of chocolate sauce = 30 grams
Ratio of chocolate to milliliters of chocolate sauce = 30:200
Let, 
x be the milliliters of sauce made from 450 grams of chocolate 
Ratio of chocolate to ml of sauce = x:450
Using proportion; 
Ratio of chocolate to ml of sauce:: ratio of chocolate to ml of sauce 

Product of extreme = Product of mean 

Dividing both sides by 30 

450 grams of chocolate will make 3000 milliliters of chocolate sauce.
We will convert this in liters.
1 liter = 1000 ml 
3000 ml =  = 3 liters
 = 3 liters
Pierre can make 3 liters of chocolate sauce from 450 grams of chocolate.
Keywords: ratio, proportion 
Learn more about proportion at:
#LearnwithBrainly