An engineering team builds a highway. After it is paved (2/9), there are still 140 kilometers left. How many kilometers have been paved?
某工程队修一条高速公路，铺好(2/9)后，还剩下140千米，已铺好多少千米．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/9)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">140 / (7/9)</gadget>
<output>180</output>

<gadget id="calculator">180 - 140</gadget>
<output>40</output>

<result>40</result>