Question

For each of the problems below, do the following:

Answer 1

Answer: (3) 3 liters   (4) Woodwind = 180, Brass = 90, Percussion = 10

Step-by-step explanation:

3) Set up a table. Multiply across and add down to create the equation.

$\begin{array}{l|c|c|c}&\underline{\quad Qty\quad}&\underline{\quad \% \quad}&\underline{\quad Qty \times \% \quad}\\\text{Whole Milk}&4&.035&4(.035)\\\underline{\text{Skim Milk\quad}}&\underline{\qquad x\qquad} &\underline{\qquad 0\qquad}&\underline{\qquad x(0)\qquad}\\\text{Mixture}&4+x&.02&4(.035)+x(0)\\\end{array}\\\\\\.\qquad \qquad (4+x)(.02)=4(.035)+x(0)\\\\.\qquad \qquad (4+x)(.02)=.14\\\\.\qquad \qquad 4+x\quad \qquad =7\qquad \longrightarrow \text{divided both sides by .02}$

                    x             = 3        ---> subtracted 4 from both sides

4)

Woodwind: 2x

Brass:            x

Percussion:   x - 80

      TOTAL:  4x - 80 = 280

                     4x         = 360      ----> added 80 to both sides

                       x         =  90       ---> divided 4 from both sides

Woodwind: 2x ---> 2(90) = 180

Brass:           x  --->     90

Percussion:  x - 80 ---> 90 - 80 = 10