There are three classes in the sixth grade of Hongxing Primary School. There are 75 students in the two classes A and B, and 81 students in the two classes B and C. Now the students in Class B account for 3/10 of the whole grade. How many students are there in the sixth grade in this school?
红星小学六年级三个班，甲、乙两个班共有学生75人，乙丙两班共有81人，现在乙班学生占全年级的(3/10)，该校六年级共有学生多少人？
<gadget id="calculator">75 + 81</gadget>
<output>156</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">156 / (13/10)</gadget>
<output>120</output>

<result>120</result>