There are 80 apple trees in the orchard, peach trees (4/5), and pear trees (1/2) the number of peach trees. How many pear trees are there in the orchard?
果园里有苹果树80棵，是桃树的(4/5)，梨树是桃树棵数的(1/2)，果园里梨树有多少棵？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 / (4/5)</gadget>
<output>100</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<result>50</result>