The number of peach trees in the orchard is 2/5 of that of apple trees, the number of apple trees is 2/3 of that of pear trees, and the number of peach trees is equal to the number of pear trees.
果园里桃树棵数是苹果树的(2/5)，苹果树棵数是梨树的(2/3)，桃树棵数是梨树的多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / (2/3)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(2/5) / (3/2)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>