There are 98 boys and 112 girls in the fifth grade of Hongxing Primary School. The number of students in the fourth grade is less than that in the fifth grade (2/7). How many students are there in the fourth grade?
红星小学五年级有男生98人、女生112人、四年级学生人数比五年级少(2/7)，四年级有多少名学生？
<gadget id="calculator">98 + 112</gadget>
<output>210</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">210 * (5/7)</gadget>
<output>150</output>

<result>150</result>