A group has 4 boys and 5 girls, how many girls account for the whole group?
一小组有4名男生5名女生，女生人数占全组人数的多少．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>