There are 5 fewer boys than girls in a class. After the girls leave (1/5), there are still 40 people in the class. How many people are there in the class?
某班男生比女生少5人，女生转走(1/5)后，全班还有40人，全班原有多少人？
<gadget id="calculator">5 + 40</gadget>
<output>45</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">45 / (9/5)</gadget>
<output>25</output>

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<gadget id="calculator">25 + 20</gadget>
<output>45</output>

<result>45</result>