1 cup of his favorite drink = 1/2 cup of regular milk + 3/4 cup of chocolate milk
Let:
A = Favorite drink
B = Regular milk
C = Chocolate milk
He wishes to make 15 cups of this mature to enjoy throughout the week, so:
[tex]\begin{gathered} A=\frac{1}{2}B+\frac{3}{4}C \\ \text{Multiply both sides by 15:} \\ 15\cdot A=15\cdot(\frac{1}{2}B+\frac{3}{4}C) \\ 15A=\frac{15}{2}B+\frac{45}{4}C \end{gathered}[/tex]He will need to mix 15/2 cup of regular milk and 45/4 cup of chocolate milk
