The school held a chorus of male and female students to celebrate "June 1st". It was originally planned that the number of girls in the chorus team would account for 40% of the total number of choir members. Later, considering the effect of the chorus, 5 of the girls were replaced by 5 boys. The ratio of the number of people is 3:7. How many boys and girls are there in the chorus?
学校举行庆"六一"男女生大合唱，原计划合唱队中女生人数占合唱队总人数的40%，后来考虑到合唱效果，将其中5名女生换成了5名男生，这时女生与男生人数的比是3：7．合唱队共有男女生多少名？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 / (1/10)</gadget>
<output>50</output>

<result>50</result>