The extracurricular interest group needs to make a batch of cartoon pictures. If it makes 30 pictures a day, it will be finished 12 days later than planned. If it makes 40 pictures a day, it can be finished 4 days ahead of schedule. So how many cartoon pictures are there in total?
课外兴趣小组要制作一批卡通图片，如果每天做30个，则要比计划晚12天完成，如果每天做40个，就可以提前4天完成．那么这批卡通图片共有多少个？
<gadget id="calculator">30 * 12</gadget>
<output>360</output>

<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<gadget id="calculator">360 + 160</gadget>
<output>520</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<gadget id="calculator">520 / 10</gadget>
<output>52</output>

<gadget id="calculator">52 + 12</gadget>
<output>64</output>

<gadget id="calculator">30 * 64</gadget>
<output>1_920</output>

<result>1_920</result>