There are two classes A and B. There are 55 students in Class A and 35 students in Class B. After transferring some people from class A to class B, the number of people in class B is exactly the same as class A (4/5). How many people were transferred from Class A?
有甲、乙两个班的学生，甲班学生有55人，乙班学生有35人．从甲班调一些人到乙班后，这时乙班的人数正好是甲班(4/5)．从甲班调出多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">55 * (4/5)</gadget>
<output>44</output>

<gadget id="calculator">44 - 35</gadget>
<output>9</output>

<gadget id="calculator">(4/5) + 1</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">9 / (9/5)</gadget>
<output>5</output>

<result>5</result>