There are 275 students in the first grade of a certain school, which is 19 students less than 1.5 times of the number in the second grade. How many students are there in the first and second grades? (solution by equation)
某校一年级有学生275人，比二年人数的1.5倍少19人，一、二年级共有学生多少人？(用方程解)
<gadget id="calculator">19 + 275</gadget>
<output>294</output>

<gadget id="calculator">294 / 1.5</gadget>
<output>196</output>

<gadget id="calculator">275 + 196</gadget>
<output>471</output>

<result>471</result>