There are 148 students in the second grade of a certain school, 19 more than the third grade. How many students are there in the second and third grades?
某校二年级有学生148人，比三年级多19人．二年级、三年级共有学生多少人？
<gadget id="calculator">148 - 19</gadget>
<output>129</output>

<gadget id="calculator">148 + 129</gadget>
<output>277</output>

<result>277</result>