The number 12 less than a number (4/5) is 45.6, find this number.
比一个数的(4/5)少12的数是45.6，求这个数．
<gadget id="calculator">45.6 + 12</gadget>
<output>57.6</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">57.6 / (4/5)</gadget>
<output>72</output>

<result>72</result>