Some wires in the school are used to decorate the classrooms. Due to insufficient wires, another 50 meters have been bought, and 35.5 meters have been used. Now there are 82.6 meters of wires in total. How many meters of wires did the school have?
学校有些电线用于装修教室，由于电线不够，又买进50米，已经用去35.5米，现在共有电线82.6米，学校原来有多少米电线．
<gadget id="calculator">50 - 35.5</gadget>
<output>14.5</output>

<gadget id="calculator">82.6 - 14.5</gadget>
<output>68.1</output>

<result>68.1</result>