The number 5 less than a number (5/8) is 8.5, find this number.
比一个数的(5/8)少5的数是8.5，求这个数．
<gadget id="calculator">8.5 + 5</gadget>
<output>13.5</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">13.5 / (5/8)</gadget>
<output>21.6</output>

<result>21.6</result>