the rate for placing an ad in a magazine for 1 week is $10.00 for the first 20 words, and $0.60 for each additional word. what is the total of a 35-word advertisement for 1 week
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Step-by-step explanation:
Then expressing the information in the problem symbolically we have:
A
=
1
2
B
B
=
3
C
A
+
B
+
C
=
44
and we want to determine
C
From the first two equations, we have
A
=
1
2
B
=
1
2
(
3
C
)
=
3
2
C
Substituting
A
=
3
2
C
and
B
=
3
C
into the third equation we find:
44
=
A
+
B
+
C
=
(
3
2
C
)
+
3
C
+
C
=
11
2
C
Multiplying both ends by
2
11
we find
C
=
8
So Charles is 8 years old.
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