60% of a number is 16, what is its 50%?
一个数的60%是16，它的50%是多少．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">16 / (3/5)</gadget>
<output>80/3 = around 26.666667</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(80/3) * (1/2)</gadget>
<output>40/3 = around 13.333333</output>

<result>40/3 = around 13.333333</result>