The railway workers repaired the railway and replaced the original 6-meter old rails with new 9-meter-long rails. A total of 240 old rails were replaced. How many new rails were replaced? (proportional solution)
铁路工人修铁路，用每根长9米的新铁轨替换原来每根6米的旧铁轨，共换下旧铁轨240根，换上的新铁轨有多少根？(比例解)
<gadget id="calculator">6 * 240</gadget>
<output>1_440</output>

<gadget id="calculator">1_440 / 9</gadget>
<output>160</output>

<result>160</result>