There are 1,250 students in Xinmin Road Primary School. The number of first-grade students accounts for 1/5 of the total number of students in the school, and the number of second-grade students is 150 less than twice the number of first-grade students. How many students are there in the second grade?
新民路小学有学生1250人，一年级学生人数占全校学生人数的(1/5)，二年级学生人数比一年级人数的2倍少150人．二年级有学生多少人？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1_250 * (1/5) * 2</gadget>
<output>500</output>

<gadget id="calculator">500 - 150</gadget>
<output>350</output>

<result>350</result>