There are 720 peach trees in the orchard, 20% less than apricot trees. How many almond trees are there in the orchard?
果园有桃树720棵，比杏树少20%．果园有杏树多少棵？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">720 / (4/5)</gadget>
<output>900</output>

<result>900</result>