A chef uses a recipe with these ingredients. The chef decides to make more than 1 batch of the recipe.
Onions: 2
Celery: 1
Garlic: 1
Carrots: 3
If a total of 20 cups of onions and carrots were used, how many batches did the chef make?

4 batches
5 batches
8 batches
10 batches