If a number is 25% more than it is 50, what is the number?
一个数多它的25%后是50，这个数是多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">50 / (5/4)</gadget>
<output>40</output>

<result>40</result>