Mom buys 2 bottles of laundry detergent, pays the salesperson 20 yuan, and gets back 8 yuan. How much is each bottle of laundry detergent?
妈妈买2瓶洗衣液，付给营业员20元，找回8元，每瓶洗衣液多少元？
<gadget id="calculator">20 - 8</gadget>
<output>12</output>

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

<result>6</result>