For a rope, 40% of the total length is cut off for the first time, and 15 meters are cut off for the second time, but only 1/3 of the total length remains. How long is the rope in meters?
一根绳子，第一次截去总长的40%，第二次截去15米，结果还剩总长的(1/3)，这根绳子原来长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">15 / (4/15)</gadget>
<output>225/4 = around 56.25</output>

<result>225/4 = around 56.25</result>