There are 200 apple trees in the orchard, which is 20 more than the number of pear trees (4/5). How many pear trees are there?
果园里有苹果树200棵，比梨树棵树的(4/5)多20棵，梨树有多少棵．
<gadget id="calculator">200 - 20</gadget>
<output>180</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">180 / (4/5)</gadget>
<output>225</output>

<result>225</result>