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Anonymous
Two similar e-books and three similar apps cost $30. One such e-book and two such apps cost $17. What is the cost of one e-book?
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Answered by
oobleck
2b+3a = 30
b+2a = 17
eliminate a via
4b+6a = 60
3b+6a = 51
b = 9
also, a=4
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