After multiplying a number by 8, add (1/5) and divide by 4, the result is 1, what is the number?
一个数乘8后，加(1/5)再除以4，结果是1，这个数是多少．
<gadget id="calculator">1 / 5 / 4</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">(19/20) / 2</gadget>
<output>19/40 = around 0.475</output>

<result>19/40 = around 0.475</result>