There are 3 boxes of towels, each box contains 12 packs, and each pack contains 20 pieces. How many towels are there in total?
有3箱毛巾，每箱装12包，每包20条．共有毛巾多少条？
<gadget id="calculator">12 * 3 * 20</gadget>
<output>720</output>

<result>720</result>