There are 48 pieces of steel in a pile, and each piece is 2.45 meters long. 35.8 meters have been used up, how many meters are left?
一堆钢材有48根，每根长2.45米．用去了35.8米，还剩下多少米．
<gadget id="calculator">2.45 * 48</gadget>
<output>117.6</output>

<gadget id="calculator">117.6 - 35.8</gadget>
<output>81.8</output>

<result>81.8</result>