There are 180 students in the third grade of the Hope Primary School, and there are more students in the fourth grade than in the third grade (2/9). How many students are there in the third and fourth grades of the Hope Primary School?
希望小学三年级有学生180人，四年级的学生比三年级多(2/9)，希望小学三、四年级共有学生多少人？
<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">180 * (11/9)</gadget>
<output>220</output>

<gadget id="calculator">220 + 180</gadget>
<output>400</output>

<result>400</result>