There are 45 trees planted in the orchard of Uncle Wang’s house, among which (2/5) are apple trees. How many apple trees are there?
王叔叔家的果园里种了45棵树，其中(2/5)是苹果树，苹果树有多少棵？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">45 * (2/5)</gadget>
<output>18</output>

<result>18</result>