There are 30 pear trees, the number of pear trees is more than peach trees (1/5), how many more pear trees than peach trees.
梨树有30棵，梨树的棵数比桃树多(1/5)，梨树比桃树多多少棵．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 / (6/5)</gadget>
<output>25</output>

<gadget id="calculator">25 * (1/5)</gadget>
<output>5</output>

<result>5</result>