Answer:
1. To adjust the recipe to make 30 rolls instead of 12, you will need to multiply the amount of each ingredient by 2.5.
2. I determined this number by dividing the desired number of rolls (30) by the number of rolls the recipe makes (12). 30 ÷ 12 = 2.5
3. To make 30 rolls, you will need 0.25 oz × 2.5 = 0.625 oz of yeast.
4. To make 30 rolls, you will need 1/3 cup × 2.5 = 5/6 cup of powdered milk.
5. To make 30 rolls, you will need 6 tablespoons × 2.5 = 15 tablespoons of butter.
6. To make 30 rolls, you will need (3.5 cups × 2.5) - (0.5 cup × 2.5) = 7.5 cups of bread flour more than whole wheat flour.