There is a bamboo pole with uniform thickness and scales. Put 4 chess pieces in the plastic bag with scale 3 on the left, and how many chess pieces should be put in the plastic bag with scale 2 on the right to ensure the balance of the bamboo pole.
有一根粗细均匀刻有刻度的竹竿，在左边的刻度3的塑料袋里放入4个棋子，在右边的刻度2的塑料袋里应放入多少个棋子才能保证竹竿的平衡．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>