A bag of salt weighs (1/2) kilogram, and (1/5) of it is used, how many kilograms are used?
一袋盐重(1/2)千克，用了它的(1/5)，用了多少千克？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) * (1/5)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>