Alicia has to buy some books for the new school year. She buys 2 math books, 3 art books, and 6 science books, for a total of $30. If both the math and science books cost $3 each, what was the cost of each art book?
The total cost of maths books is 2*3 = <<2*3=6>>6 dollars
The total cost of science books is 6*3 = <<6*3=18>>18 dollars
The total cost for maths and science books is 6+18 = <<6+18=24>>24 dollars
The cost for art books is 30-24 = <<30-24=6>>6 dollars.
Since he bought 3 art books, the cost for each art book will be 6/3 = 2 dollars
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