A number, minus 20% of it, plus 5, is still 3 smaller than the original. So, what is this number.
一个数，减去它的20%，再加上5，还比原来小3．那么，这个数是多少．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / (1/5)</gadget>
<output>40</output>

<result>40</result>