In the multimedia classroom, boys accounted for 2/3 of the total number of students. Later, 4 girls came in. At this time, the ratio of boys to the total number of students was 8:13. How many people were there in the multimedia classroom?
在多媒体教室里男生人数占学生总数的(2/3)，后来又进来4名女生，这时男生和学生总数的比是8：13，多媒体教室原来有多少人？
<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(5/8) - (1/2)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / (1/8) / (2/3)</gadget>
<output>48</output>

<result>48</result>