0.8 is 2(1/5) less than (1/4) of a number, find this number.
0.8比一个数的(1/4)少2(1/5)，求这个数．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / (1/4)</gadget>
<output>4</output>

<result>4</result>