(16/5) is less than 25% of a number (2/5), find this number.
(16/5)比一个数的25%少(2/5)，求这个数．
<gadget id="calculator">16 / 5</gadget>
<output>16/5 = around 3.2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(16/5) + (2/5)</gadget>
<output>18/5 = around 3.6</output>

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

<gadget id="calculator">(18/5) / (1/4)</gadget>
<output>72/5 = around 14.4</output>

<result>72/5 = around 14.4</result>