There are 250 students in the fourth grade, and the number of the fifth grade is more than that of the fourth grade (1/5), so how many people are there in the fourth and fifth grades?
四年级250人，五年级的人数比四年级多(1/5)，那么四年级和五年级共有多少人？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">250 * (1/5)</gadget>
<output>50</output>

<gadget id="calculator">250 + 50 + 250</gadget>
<output>550</output>

<result>550</result>