There are 280 peach trees in the orchard, which happen to be pear trees (4/5). How many pear trees are there?
果园有桃树280棵，正好是梨树的(4/5)．梨树有多少棵？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">280 / (4/5)</gadget>
<output>350</output>

<result>350</result>