One rope is as long as the other (4/5), and the other is longer than the other by how much.
一根绳长是另一根的(4/5)，另一根比一根长多少．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>