There are 4 people in the aircraft model team, and 16 aircraft models are to be made. Now each person has made 3 models, how many more will be made?
航模小组有4人，要做16架飞机模型，现在每人做了3架，还要做几架？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

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

<result>4</result>