A rope is 180cm, cut 3 times, how many centimeters is each length
一根绳子180cm，剪了3次，每段长多少cm
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<result>45</result>