Cut a steel wire 12 meters long into two sections. The ratio of the length of the first section to the second section is 4:5. What is the length of the second section in meters?
把一条长12米的钢丝截成两段，第一段与第二段长度的比是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">12 * (5/9)</gadget>
<output>20/3 = around 6.666667</output>

<result>20/3 = around 6.666667</result>