Yumin Primary School has 840 male students and 4/7 female students. How many female students are there in this school?
育民小学有男同学840人，女同学人数是男同学的(4/7)，这个学校有女同学多少人？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">840 * (4/7)</gadget>
<output>480</output>

<result>480</result>