Hope that there are 209 students in the third grade of the primary school, and the number of the third grade is more than that of the fourth grade (2/9). How many students are there in the fourth grade?
希望小学三年级有学生209人，三年级的人数比四年级多(2/9)，四年级有学生多少人？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 + (2/9)</gadget>
<output>11/9 = around 1.222222</output>

<gadget id="calculator">209 / (11/9)</gadget>
<output>171</output>

<result>171</result>