Cut a 36-meter-long rope into two sections. The ratio of the first section to the second section is 4:5. What is the length of the second section?
把一条长36米的绳截成两段，第一段和第二段的比是4：5，第二段长多少米．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">36 * (5/9)</gadget>
<output>20</output>

<result>20</result>