Chris bought 8 movies on DVD for $12 each and 4 movies on Blu-ray for $18 each. What is the average price he paid per movie?
He spent a total of 8 * $12 + 4 * $18 = $
<gadget id="calculator">8*12+4*18</gadget>
<output>168</output>
168.
He bought a total of 8 + 4 = 
<gadget id="calculator">8+4</gadget>
<output>12</output>
12 movies.
The average price is $168 / 12 = $
<gadget id="calculator">168/12</gadget>
<output>14</output>
14 per movie.

<result>14</result>