The number 4 more than (4/5) of a number is 28. Find this number.
比一个数的(4/5)多4的数是28，求这个数．
<gadget id="calculator">28 - 4</gadget>
<output>24</output>

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

<gadget id="calculator">24 / (4/5)</gadget>
<output>30</output>

<result>30</result>