Answer:
249 gallons of 7% butterfat milk and 83 gallons of 3% butterfat milk
Step-by-step explanation:
If x is the gallons of 7% butterfat milk, and y is the gallons of 3% butterfat milk, then:
x + y = 332
0.07x + 0.03y = 0.06(332)
Solve the system of equations using substitution:
0.07x + 0.03(332 − x) = 0.06(332)
0.07x + 9.96 − 0.03x = 19.92
0.04x = 9.96
x = 249
y = 332 − x
y = 83
You need 249 gallons of 7% butterfat milk and 83 gallons of 3% butterfat milk.
