There are 25 litchi trees in the orchard, and (1/4) of the longan tree is equal to (2/5) of the litchi tree. How many longan trees are there?
果园里有荔枝树25棵，龙眼树的(1/4)等于荔枝树的(2/5)，龙眼树有多少棵．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) / (1/4)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">25 * (8/5)</gadget>
<output>40</output>

<result>40</result>