a 50-gallon barrel of milk is 6% butterfat. How much skim milk (no butterfat) should be mixed to make milk that is 3% butterfat?
i am so confused.. please help.
Hello, Heather!
A 50-gallon barrel of milk is 6% butterfat.
How much skim milk (no butterfat) should be mixed to make milk that is 3% butterfat?
. . $\displaystyle \begin{array}{|c|c|c|c|}
& \text{gallons} & \text{Percent} & \text{butterfat} \\ \hline
A & 50 & 6\% & 0.06(50) \\
\text{skim} & x & 0\% & 0 \\ \hline
\text{Mix} & x+50 & 3\% & 0.03(x+50) \end{array}$
Last column: . $\displaystyle 3 + 0 \;=\;0.03(x+50)$
Go for it!