20% of a number is (1/2), what is (1/2) of this number.
一个数的20%是(1/2)，这个数的(1/2)是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) / (1/5)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * (1/2)</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>