The school has a track and field team and a chorus team. The number of the chorus team is 3/5 of the total number of the two teams. If 6 people are transferred from the chorus team to the track and field team, the ratio of the number of the chorus team to the track and field team is 3:4. How many people were there in the chorus?
学校设有田径队和合唱队，合唱队人数是两队总人数的(3/5)，若从合唱队调出6人到田径队，则合唱队与田径队人数的比是3：4，合唱队原有多少人？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/5) - (3/7)</gadget>
<output>6/35 = around 0.171429</output>

<gadget id="calculator">6 / (6/35)</gadget>
<output>35</output>

<result>35</result>