Column formula calculation: 2.5 times of 8 is 7.2 less than 40% of a number, find this number.
列式计算：8的2.5倍比一个数的40%少7.2，求这个数．
<gadget id="calculator">8 * 2.5</gadget>
<output>20</output>

<gadget id="calculator">20 + 7.2</gadget>
<output>27.2</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">27.2 / (2/5)</gadget>
<output>68</output>

<result>68</result>