In class 1 of the sixth year, girls accounted for the whole class (6/13). Later, 2 girls and 2 boys were transferred. Now girls account for 13/28 of the whole class. How many people are there in Class 1 of the sixth year?
六年1班原来女生占全班人数的(6/13)．后来转来2名女生和2名男生，现在女生占全班人数的(13/28)，六年1班现在有多少人．
<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">4 * (6/13)</gadget>
<output>24/13 = around 1.846154</output>

<gadget id="calculator">2 - (24/13)</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">13 / 28</gadget>
<output>13/28 = around 0.464286</output>

<gadget id="calculator">(13/28) - (6/13)</gadget>
<output>1/364 = around 0.002747</output>

<gadget id="calculator">(2/13) / (1/364)</gadget>
<output>56</output>

<result>56</result>