An equation is formed of two equal expressions. The amount of 20% milk and 12% milk that is needed to be mixed is 7.5 gallons and 12.5 gallons, respectively.
An equation is formed when two equal expressions are equated together with the help of an equal sign '='.
Let the amount of 20%milk mixed be represented by x, while the amount of 12% milk mixed is represented by y. Therefore, the two-equation can be written as,
x+y=20 gallons
0.20x + 0.12y = (0.15×20)
Solve the first equation for x, therefore,
x = 20 - y
substitute the value of x in the second equation,
0.20(20-y) + 0.12y = 3
4 - 0.2y +0.12y = 3
-0.08y = -1
y = 12.5 gallons
substitute the value of y in the first equation,
x + 12.5 = 20
x = 7.5 gallons
Hence, the amount of 20% milk and 12% milk that is needed to be mixed is 7.5 gallons and 12.5 gallons, respectively.
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