The ratio of the number of boys to the number of girls in the sixth grade is 5:4, and the number of girls accounts for the total number of students in the whole grade ((())/(())).
六年级男生人数和女生人数的比是5：4，女生人数占全年级总人数的((())/(()))．
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>