In the last semester, the ratio of male to female students in the fifth grade was 6:5. Later, when the school started, 2 girls were transferred away. At this time, the number of girls was the whole grade (4/9). How many students are there in this grade now?
上学期五年级男女生学生人数比是6：5，后来开学时，转走了2名女生，这时女生人数是全年级人数的(4/9)．求这个年级现在有多少学生？
<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

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

<gadget id="calculator">(5/11) - (4/9)</gadget>
<output>1/99 = around 0.010101</output>

<gadget id="calculator">2 / (1/99)</gadget>
<output>198</output>

<result>198</result>