The supermarket shipped 8 boxes of eggs, each weighing 12 kilograms, and after selling some, there were 42 kilograms left. How many kilograms were sold?
超市运来8箱鸡蛋，每箱12千克，卖出一些后，还剩42千克．卖出了多少千克？
<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">96 - 42</gadget>
<output>54</output>

<result>54</result>