The school needs to lay computer network cables. A network cable with a length of 135.5 meters has been used up to 76.8 meters. How much less is the remaining meter than the used one?
学校要铺设电脑网线，一根长135.5米的网线用去了76.8米，剩下的比用去的少多少米？
<gadget id="calculator">135.5 - 76.8</gadget>
<output>58.7</output>

<gadget id="calculator">76.8 - 58.7</gadget>
<output>18.1</output>

<result>18.1</result>