Xiao Ming’s family has raised some ducks. If you want to know how many there are, think about it carefully: “Half of the ducks are in the water, half of them are divided by 2 and they are going into the water. The remaining 15 are eating sundries around Xiao Ming. ?"
小明家养了一些鸭子要知有多少，细细想一想："鸭子一半下了水，一半除以2正往水里走，剩下15只围着小明身边吃杂物，你说有几只？"
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / (1/4)</gadget>
<output>60</output>

<result>60</result>