20 plus 35% of a number is exactly equal to 55. Find this number.
20加上一个数的35%正好等于55，求这个数．
<gadget id="calculator">55 - 20</gadget>
<output>35</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">35 / (7/20)</gadget>
<output>100</output>

<result>100</result>