There are a total of students in our school. In the 6th art festival, the students who performed on stage accounted for (4/7), how many students performed on stage?
我校共有学生a人．第六届艺术节中，上台演出的学生占(4/7)，上台演出的学生有多少人．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>