There are 250 students in the sixth grade, which is equivalent to (5/7) of the fifth grade. How many students are there in the fifth and sixth grades?
六年级有学生250人，相当于五年级人数的(5/7)，五、六年级一共有多少人？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">250 / (5/7)</gadget>
<output>350</output>

<gadget id="calculator">250 + 350</gadget>
<output>600</output>

<result>600</result>