Every 12 pencils are packed into a box, and every 20 boxes of pencils are packed into a box. If we want to pack 4 boxes now, how many pencils are needed?
每12支铅笔装一盒，每20盒铅笔装一箱，现要装4箱，需要多少支铅笔？
<gadget id="calculator">12 * 20 * 4</gadget>
<output>960</output>

<result>960</result>