A piece of 20-meter-long iron wire used up 8.53 meters for the first time, and 2.3 meters less for the second time than the first time. How many meters are left?
一段20米长的铁丝，第一次用去8.53米，第二次比第一次少用2.3米，还剩下多少米？
<gadget id="calculator">8.53 - 2.3</gadget>
<output>6.23</output>

<gadget id="calculator">20 - 8.53 - 6.23</gadget>
<output>5.24</output>

<result>5.24</result>