Boys accounted for 5/6 of the number of girls in the chorus, and 9 girls were added later. At this time, boys accounted for 2/5 of the chorus. How many people were there in the chorus?
合唱队中男生占女生人数的(5/6)，后来又增加了9个女生，这时，男生占合唱队人数的(2/5)，合唱队原来有多少人？
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(3/2) - (6/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">9 / (3/10) / (5/11)</gadget>
<output>66</output>

<result>66</result>