It is known that milk candy is 12 yuan per kilogram, fruit candy is 15 yuan per kilogram, and halva is 20 yuan per kilogram. If these three kinds of sugar are mixed together at a ratio of 1:2:3 to make assorted candies, then the average price of this assorted candy per kilogram how much?
已知奶糖每千克12元，水果糖每千克15元，酥糖每千克20元，如果把这三种糖按1：2：3混在一起做成什锦糖，那么这种什锦糖平均每千克多少元？
<gadget id="calculator">12 * 1</gadget>
<output>12</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">12 + 30 + 60</gadget>
<output>102</output>

<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">102 / 6</gadget>
<output>17</output>

<result>17</result>