If I have a recipe that serves 4 people and I need to serve 10 people, how much of each ingredient do I need to buy?

Scaling a recipe to accommodate more or fewer servings requires a bit of math, but it's not difficult with some simple calculations. To adjust a recipe that serves 4 to serve 10, follow these steps:

1. Determine the conversion factor by dividing the desired number of servings (10) by the original number of servings (4). In this case, 10/4 = 2.5.
2. Multiply the ingredient quantities by the conversion factor. For example, if the recipe calls for 1 cup of flour, you would multiply by 2.5 to get 2.5 cups of flour.
3. Round the quantities to the nearest measurable amount. For instance, if the recipe calls for 1 tablespoon of an ingredient, you can round to the nearest half tablespoon or quarter tablespoon.

It's important to note that this method is not always precise, especially when dealing with smaller amounts of ingredients or complex recipes. In these cases, it may be necessary to adjust the recipe by taste as well.