A piece of rope, cut half of more than 2dm, leaving 15dm. How many decimeters was this rope originally?
一根绳子，剪去一半多2dm，还剩下15dm．这根绳子原来长多少分米？
<gadget id="calculator">15 + 2</gadget>
<output>17</output>

<gadget id="calculator">17 * 2</gadget>
<output>34</output>

<result>34</result>