store buys two different candies, A and B, and the money spent to buy candy A is twice that of candy B. It is known that type A sugar is 60 yuan per kilogram, and type B sugar is 20 yuan per kilogram. If these two kinds of sugar are mixed together and sold as assorted sugar, what is the cost per kilogram of this kind of sugar?
商店购进甲、乙两种不同的糖果，购买甲种糖所用的钱是购买乙种糖的2倍．已知甲种糖每千克60元，乙种糖每千克20元，如果把这两种糖混在一起作为什锦糖出售，那么这种糖每千克的成本是多少元．
<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">120 + 60</gadget>
<output>180</output>

<gadget id="calculator">2 / 2 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">60 * (1/20)</gadget>
<output>3</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">180 / 5</gadget>
<output>36</output>

<result>36</result>