The number of fifth-grade students in Donghua Primary School is 1.4 times that of fourth-grade students. There are 266 students in fifth grade. How many students are there in fourth and fifth grade?
东华小学五年级学生的人数是四年级的1.4倍，五年级有266人，四、五年级一共有多少人？
<gadget id="calculator">266 / 1.4</gadget>
<output>190</output>

<gadget id="calculator">190 + 266</gadget>
<output>456</output>

<result>456</result>