There are 180 students in the first grade of Sunshine Primary School, which is 1.5 times the number of students in the second grade. How many students are there in the first and second grades?
阳光小学一年级有学生180人，是二年级人数的1.5倍，一、二年级共有多少人？
<gadget id="calculator">180 / 1.5</gadget>
<output>120</output>

<gadget id="calculator">180 + 120</gadget>
<output>300</output>

<result>300</result>