Answer:
800 quarts of low-fat milk should be added.
Explanation:
Let x be the number of quarts of low-fat milk to be added.
We can set up the equation:
0.06(200) + 0.015x = 0.024(200 + x)
Simplifying the equation, we get:
12 + 0.015x = 4.8 + 0.024x
0.009x = 7.2
x = 800
Therefore, 800 quarts of low-fat milk should be added to produce milk containing 2.4% butterfat.