The store shipped 15 boxes of towels, each box contains 10 packs, and each pack contains 20 towels. How many towels did the store ship in total?
商店运来15箱毛巾，每箱有10包，每包有20条，这个商店共运来多少条毛巾．
<gadget id="calculator">15 * 10 * 20</gadget>
<output>3_000</output>

<result>3_000</result>