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?
How much did the maths books cost? ** The total cost of maths books is 2*3 = <<2*3=6>>6 dollars
How much did the science books cost? ** The total cost of science books is 6*3 = <<6*3=18>>18 dollars
How much did the maths and science books cost? ** The total cost for maths and science books is 6+18 = <<6+18=24>>24 dollars
How much did the art books cost? ** The cost for art books is 30-24 = <<30-24=6>>6 dollars.
How much did each art book cost? ** Since he bought 3 art books, the cost for each art book will be 6/3 = 2 dollars
#### 2