A bundle of cables took 45 meters. There are still (4/9) left. How many meters is this bundle of cables?
一捆电缆线用去了45米．还剩(4/9)没用完．这捆电缆线一共有多少米？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">45 / (5/9)</gadget>
<output>81</output>

<result>81</result>