A small store bought two kinds of nuts, and they spent the same amount of money. It is known that the prices of the two kinds of nuts are 3 yuan and 6 yuan per kilogram respectively. If you mix the two kinds of nuts and buy them again, then the mixed What is the cost of kernels per kilogram?
某小店进了两种不同的果仁，所用的钱一样多，已知两种果仁的价钱分别是每千克3元和6元，若将两种果仁混合后再买，那么，混合后果仁的成本是每千克多少元．
<gadget id="calculator">6 / 3</gadget>
<output>2</output>

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

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 * (2/3)</gadget>
<output>2</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 * (1/3)</gadget>
<output>2</output>

<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<result>4</result>