A rope is folded into 5 strands and 6 strands respectively. If each strand is 20 cm longer than 6 strands, what is the length of the strand in centimeters?
一把一根绳子分别折成5股和6股，如果折成5股比折成6股每股长20厘米，那么这根绳子的长度是多少厘米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">20 / (1/30)</gadget>
<output>600</output>

<result>600</result>