There are 30 pear trees, and the number of peach trees is less than that of pear trees (2/5). How many peach trees are there?
梨树有30棵，桃树的棵数比梨树少(2/5)，桃树有多少棵．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 * (3/5)</gadget>
<output>18</output>

<result>18</result>