The number of girls in Class Six and Three accounted for the whole class (6/13). Later, 4 girls moved away, and now the number of girls in Class Six and Three accounted for the whole class (5/12). How many people are there in Class Six and Three?
六3班女生人数占全班人数的(6/13)，后来有4名女生转走，现在女生人数占全班的(5/12)，现在六3班有多少人？
<gadget id="calculator">13 - 6</gadget>
<output>7</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">12 - 5</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(6/7) - (5/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">1 - (6/13)</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">4 / (1/7) / (7/13)</gadget>
<output>52</output>

<gadget id="calculator">52 - 4</gadget>
<output>48</output>

<result>48</result>