Mom bought 6 bags of washing powder, each bag was 2 kg, 8 kg was used up, how many kg are left?
妈妈买来6袋洗衣粉，每袋2千克，用去了8千克，还剩多少千克？
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<result>4</result>