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Mark went to an electronic store, purchased 2 CDs and 6 DVDs, and spent $156. Antonio went to the same store, bought 1 CD and 9 DVDs, and spent $210. How much does each CD sell for at the store? $12 $15
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Sep 21, 2017
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Mark went to an electronic store, purchased 2 CDs and 6 DVDs, and spent $156. Antonio went to the same store, bought 1 CD and 9 DVDs, and spent $210. How much does each CD sell for at the store? $12
$15
$18
$22
Mathematics
high-school
Equidamoid
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5
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Answer:
A.12
Explanation:
Got it right on the test
Hope this helps :)
Harry Moreno
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Sep 23, 2017
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Harry Moreno
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For the answer to the question above,
Let C be CD's
Let D be DVD's
2C + 6D = 156
C + 9D = 210
6D = 156 - 2C
3D = 78 - C
C + 9D = 210
C + 3(78 - C) = 210
C + 234 - 3C = 210
234 - 210 = 3C - C
24 = 2C
12 = C
The cost of one CD is $12, so the answer is a.
Tomtheengineer
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Sep 25, 2017
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