A rope is 89 meters long, 36 meters are used for the first time, and 23 meters are used for the second time. How many meters is the length of the rope shorter than before? what is the correct formula
一根绳子长89米，第一次用去36米，第二次用去23米，现在绳子的长度比原来短了多少米？正确的算式是多少
<gadget id="calculator">36 + 23</gadget>
<output>59</output>

<result>59</result>