The number of pear trees is (2/5) that of peach trees, the number of apple trees is (4/5) that of pear trees, and the number of apple trees is equal to that of peach trees.
梨树的棵数是桃树的(2/5)，苹果树的棵数是梨树的(4/5)，苹果树的棵数是桃树的多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) * (4/5)</gadget>
<output>8/25 = around 0.32</output>

<result>8/25 = around 0.32</result>