A steel pipe is 15 meters long, and 9.4 meters are used up. How many meters is the rest shorter than the used one?
一根钢管长15米，用去9.4米，剩下的比用去的短多少米？
<gadget id="calculator">15 - 9.4</gadget>
<output>5.6</output>

<gadget id="calculator">9.4 - 5.6</gadget>
<output>3.8</output>

<result>3.8</result>