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Real-World Applications
easy
0:00.0
If
3
3
3
books cost
\
21
,
h
o
w
m
u
c
h
d
o
, how much do
,
h
o
w
m
u
c
h
d
o
5$ books cost?
A
30
30
30
B
35
35
35
C
40
40
40
D
42
42
42
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