There were originally two classes in the fourth grade of a certain school, and now they are reorganized into three classes. The original class (1/4) and the original second class (1/5) form a new class, and the original class ( 1/5) and the original second class (1/4) form the new second class, and the remaining 55 people form the new third class. How many people are there in the original two classes?
某校四年级原有两个班，现在要重新编为三个班，将原一班的(1/4)与原二班的(1/5)组成新一班，将原一班的(1/5)与原二班的(1/4)组成新二班，余下的55人组成新三班，原来两个班共有多少人？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">55 / (11/20)</gadget>
<output>100</output>

<result>100</result>