This recipe makes 3 portions of potato soup.

Richard follows the recipe but wants to make 9 portions.

Complete the amounts of each ingredient that he needs.

Recipe: Serves 3

20 ml oil

30 g onions

400 g potatoes

450 ml milk

60 ml oil, 90 g onions, 1200 g potatoes, 1350 ml milk

Step-by-step explanation:

What you need to do here is multiply all of these ingredients by 3, because the recipe serves 3 and he needs to serve 9, and 9/3 = 3. Therefore, he would have to triple the recipe.