Chapter 4 Test Form C Worksheet - Tussy & Gustafson, Elementaryalgebra Page 7
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8Tussy/Gustafson, ElementaryAlgebra, 4/e
Chapter 4 Test Form C
21.
How many milliliters of a 6% acid solution and a 12% acid solution should be used to
make 250 ml of an 8% acid solution? Choose the system that would solve the
application. Let x = number of liters of 6% acid solution and y = number of liters of
12% acid solution.
R S
+ =
x y
250
a.
T
+
=
.
06
x
.
12
y
20
R S
+ =
x y
250
b.
T
+
=
.
06
x
.
12
y
250
R S
+
=
x
250
y
c.
T
+
=
.
06
x
.
12
y
20
R S
+ =
x y
250
d.
T
+
=
.
6
x
.
12
y
200
22.
Hilda wants to invest part of $6000 in an account that paid 3% and part in an account
that paid 5%. The total annual interest from both accounts is $256. How much was
invested at 5%?
a. $3800
b. $772
c. $4000
d. $3500
R
>
x
0
S |
>
23.
The solutions for the system
y
0
are in
T |
+ <
x y
3
a. Quadrant I
b. Quadrant II
c. Quadrant III
d. Quadrant IV
Page 7
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