3.2 The 16 percent difference of subtracting a number is 0, find this number. (solution by equation)
3.2减去一个数的百分之十六差是0，求这个数．(用方程解)
<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">3.2 / (4/25)</gadget>
<output>20</output>

<result>20</result>