The number of students in the fifth grade of Dongfang Primary School is 1.2 times that of the fourth grade. There are 252 students in the fifth grade. How many students are there in the fourth and fifth grades?
东方小学五年级学生人数是四年级的1.2倍，五年级有252人，四、五年级一共有多少名学生？
<gadget id="calculator">252 / 1.2</gadget>
<output>210</output>

<gadget id="calculator">210 + 252</gadget>
<output>462</output>

<result>462</result>