Mom bought back some duck eggs and 12 eggs. After eating 8 eggs, the remaining eggs were as many as duck eggs. How many eggs did mom buy in total?
妈妈买回一些鸭蛋和12个鸡蛋，吃了8个鸡蛋后，剩下的鸡蛋和鸭蛋同样多，问妈妈一共买回几个蛋？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">4 + 12</gadget>
<output>16</output>

<result>16</result>