The school has 80 students in the third grade, 20 more students in the fourth grade than the third grade, and there are (how many) students in the two grades.
学校三年级有学生80名，四年级比三年级多20名同学，两个年级共有(多少)名同学．
<gadget id="calculator">80 + 20 + 80</gadget>
<output>180</output>

<result>180</result>