There are 28 girls, accounting for 3/7 of the whole class, what percentage of the whole class are boys? What is the column
女生28人，占全班的(3/7)，男生占全班的几分之几？列式是多少
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

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