A road of 450 meters has been built (4/9), how many meters are left to be repaired?
修一段450米的路，已经修了(4/9)，还剩多少米没有修？
<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">450 * (5/9)</gadget>
<output>250</output>

<result>250</result>