At the beginning of this semester, middle school students accounted for 61% of Yucai School, and 50 primary school students transferred in later, so middle school students accounted for only 3/5 of the whole school. So how many primary school students are there at the beginning of this semester?
育才学校本学期开学时中学生占61%，后来有50名小学生转入，这样中学生就只占全校人数的(3/5)．那么本学期开学时共有小学生多少名？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">61 / 100</gadget>
<output>61/100 = around 0.61</output>

<gadget id="calculator">1 / (61/100)</gadget>
<output>100/61 = around 1.639344</output>

<gadget id="calculator">(5/3) - (100/61)</gadget>
<output>5/183 = around 0.027322</output>

<gadget id="calculator">50 / (5/183)</gadget>
<output>1_830</output>

<gadget id="calculator">1_830 * (100/61)</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 1_830</gadget>
<output>1_170</output>

<result>1_170</result>