The school held a chorus of male and female students to celebrate "June 1". It was originally planned that the number of girls in the chorus team would account for 60% of the total number of choir members. Later, considering the effect of the chorus, 5 boys will be added. At this time, the ratio of girls to boys is 6. : 5. How many boys 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60%，后来考虑到合唱效果，将增加了5名男生，这时女生与男生人数的比是6：5．合唱队原有男生多少名？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / (3/5)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(5/6) - (2/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / (1/6)</gadget>
<output>30</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<result>20</result>