70% of a number is 28 more than its 35%, what is the number?
一个数的70%比它的35%多28，这个数是多少．
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">28 / (7/20)</gadget>
<output>80</output>

<result>80</result>