One wire uses 10.5 meters, which is 5 times the remaining wire, how many meters are left?
一根铁丝用去10.5米，是剩下铁丝的5倍，剩下多少米？
<gadget id="calculator">10.5 / 5</gadget>
<output>2.1</output>

<result>2.1</result>