There are 140 apple trees in the orchard, which are less than pear trees (2/9). How many pear trees are there?
果园里有苹果树140棵，比梨树少(2/9)．梨树有多少棵？
<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>

<result>180</result>