The little sloppy did not tighten the faucet, wasting 56 milliliters of water per minute. After 15 minutes, the mother turned off the tap. Do you know how many milliliters of water the little sloppy wasted?
小马虎没有拧紧水龙头，每分钟浪费56毫升水，15分钟后，妈妈关掉了水龙头，你知道小马虎浪费了多少毫升水吗？
<gadget id="calculator">56 * 15</gadget>
<output>840</output>

<result>840</result>