The ratio of the number of people in class 1 to class 2 is 8:7. If 3 students from class 1 are transferred to class 2, the number of people in class 2 will be equal. How many people are there in class 1?
一班与二班人数的比是8：7，如果将一班的3名同学调到二班去，则两班人数相等，原来一班有多少人．
<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(8/15) - (7/15)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">2 / (1/15)</gadget>
<output>30</output>

<gadget id="calculator">3 * 30 * (8/15)</gadget>
<output>48</output>

<result>48</result>