There are a certain number of students in a class. If the number of boys increases (1/5), the number of students in the class will reach 62; if the number of girls decreases (1/5), the number of students in the class will decrease to 51. How many students are there in this class?
某班有学生若干人，如果男生增加(1/5)，全班人数就达到62人；如果女生减少(1/5)，全班人数就减少到51人；这个班原有学生多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">62 * (4/5)</gadget>
<output>248/5 = around 49.6</output>

<gadget id="calculator">51 - (248/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) * (4/5)</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">1 - (24/25)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(7/5) / (1/25)</gadget>
<output>35</output>

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

<gadget id="calculator">35 * (1/5)</gadget>
<output>7</output>

<gadget id="calculator">62 - 7</gadget>
<output>55</output>

<result>55</result>