The teacher has 4 boxes of table tennis balls, 6 in each box, and lent 8 to his classmates. How many does the teacher have now?
老师有4盒乒乓球，每盒6个，借给同学8个，老师现在还有几个？
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<result>16</result>