A steel pipe is 27 meters long and 9.8 meters are used up. How much longer is the rest than the used one?
一根钢管长27米，用去9.8米，剩下的比用去的长多少米？
<gadget id="calculator">27 - 9.8 - 9.8</gadget>
<output>7.4</output>

<result>7.4</result>