If (1/5) of number A is 10, what is its 25%?
甲数的(1/5)是10，则它的25%是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 * (1/4)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>