(2/5) of 80 is exactly 16% of a number. Find this number.
80的(2/5)正好是一个数的16%，求这个数．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">(2/5) / (4/25)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">80 * (5/2)</gadget>
<output>200</output>

<result>200</result>