A bag of table salt is 2kg, if 1/4 of it is used, how many kilograms are used?
一包食盐2kg，用去它的(1/4)，用去了几kg？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 * (1/4)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>