Answer: A.
![(3)/(30)=(x)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/ldu0vf3c7lx6ts71sjnz8o5lo50r1nm45o.png)
Explanation:
According to the recipe,
For 2 batches, 3 cups of flour required.
One batch has 15 mix rolls
Then 2 batches will have 2 (15) = 30 rolls
Each person gets one roll, so 3 cups of flour is required for 30 people.
The quanity of flour is proportional to the number of people.
Let x be the quantity of flour required for 12 people.
By proportion,
![\frac{\text{Quantity of flour}}{\text{Quanity of person}}=(3)/(30)=(x)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/c679urbk1bd600m9wz0xcz894jrc1dpbm0.png)
Required proportion:
![(3)/(30)=(x)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/ldu0vf3c7lx6ts71sjnz8o5lo50r1nm45o.png)
The correct option is A.
![(3)/(30)=(x)/(12)](https://img.qammunity.org/2022/formulas/mathematics/high-school/ldu0vf3c7lx6ts71sjnz8o5lo50r1nm45o.png)