### Section 2.3, Example 8

```example 8
Medication
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Chapter 2.3
2009 PBLPathways
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
2009 PBLPathways
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
1 liter of 0%
orange juice
=
1 liter of 100%
orange juice
2 liters of 50%
orange juice
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
1 liter of 0%
orange juice
=
1 liter of 100%
orange juice
2 liters of 50%
orange juice
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
1 liter of 0%
orange juice
=
1 liter of 100%
orange juice
?
2 liters of 50%
orange juice
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
1 liter of 0%
orange juice
=
1 liter of 100%
orange juice
22liters
litersofof50%
?%
orange juice
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
1 liter of 0%
orange juice
=
1 liter of 100%
orange juice
2 liters of 50%
orange juice
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
? of 12%
concentration
medicine
=
? of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
? of 12%
concentration
medicine
=
? of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
? of 12%
concentration
medicine
=
? of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
? of 12%
concentration
medicine
=
? of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
x cc of 12%
concentration
medicine
=
y cc of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
=
x cc of 12%
concentration
medicine
y cc of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
Amount of medicine
12% of x is
pure medicine
8% of y is
pure medicine
9% of 20 cc is
pure medicine
Amount of pure medicine
x  y  20
.12 x  .08 y  1.8
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
=
x cc of 12%
concentration
medicine
y cc of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
Amount of medicine
12% of x is
pure medicine
8% of y is
pure medicine
9% of 20 cc is
pure medicine
Amount of pure medicine
x  y  20
.12 x  .08 y  1.8
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
=
x cc of 12%
concentration
medicine
y cc of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
Amount of medicine
12% of x is
pure medicine
8% of y is
pure medicine
9% of 20 cc is
pure medicine
Amount of pure medicine
x  y  20
.12 x  .08 y  1.8
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
=
x cc of 12%
concentration
medicine
y cc of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
Amount of medicine
12% of x is
pure medicine
8% of y is
pure medicine
9% of 20 cc is
pure medicine
Amount of pure medicine
x  y  20
.12 x  .08 y  1.8
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
=
x cc of 12%
concentration
medicine
y cc of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
Amount of medicine
12% of x is
pure medicine
8% of y is
pure medicine
9% of 20 cc is
pure medicine
Amount of pure medicine
x  y  20
.12 x  .08 y  1.8
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
y  20  x
.12 x  .08  20  x   1.8
.12 x  .08  20   .08 x  1.8
.12 x  1.6  .08 x  1.8
.04 x  1.6  1.8
.04 x  0.2
x5
y  15
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
y  20  x
.12 x  .08  20  x   1.8
.12 x  .08  20   .08 x  1.8
.12 x  1.6  .08 x  1.8
.04 x  1.6  1.8
.04 x  0.2
x5
y  15
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
y  20  x
.12 x  .08  20  x   1.8
.12 x  .08  20   .08 x  1.8
.12 x  1.6  .08 x  1.8
.04 x  1.6  1.8
.04 x  0.2
x5
y  15
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
y  20  x
.12 x  .08  20  x   1.8
.12 x  .08  20   .08 x  1.8
.12 x  1.6  .08 x  1.8
.04 x  1.6  1.8
.04 x  0.2
x5
y  15
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
y  20  x
.12 x  .08  20  x   1.8
.12 x  .08  20   .08 x  1.8
.12 x  1.6  .08 x  1.8
.04 x  1.6  1.8
.04 x  0.2
x5
y  15
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
y  20  x
.12 x  .08  20  x   1.8
.12 x  .08  20   .08 x  1.8
.12 x  1.6  .08 x  1.8
.04 x  1.6  1.8
.04 x  0.2
x5
y  15
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
Amount of medicine
x  y  20
Amount of pure medicine
.12 x  .08 y  1.8
y  20  x
.12 x  .08  20  x   1.8
.12 x  .08  20   .08 x  1.8
.12 x  1.6  .08 x  1.8
.04 x  1.6  1.8
.04 x  0.2
x5
y  15
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
=
5 cc of 12%
concentration
medicine
15 of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
.6 cc is pure
medicine
1.2 cc is pure
medicine
1.8 cc is pure
medicine
A nurse has two solutions that contain different concentrations of a certain medication.
One is a 12% concentration, and the other is an 8% concentration. How many cubic
centimeters (cc) of each should she mix together to obtain 20 cc of a 9% solution?
+
=
5 cc of 12%
concentration
medicine
15 of 8%
concentration
medicine
20 cc of 9%
concentration
medicine
.6 cc is pure
medicine
1.2 cc is pure
medicine
1.8 cc is pure
medicine
```