There are two classes, Class 1 and Class 2 in Grade 6. The number of students in Class 1 accounts for 7/20 of the total number of students. The number of students in Class 1 is 3 more than half of the number of students in Class 2. What is the total number of students in Grade 6?
六年级一班、二班两个班级，其中一班的人数占总人数的(7/20)，一班的人数比二班人数的一半多3人，则六年级一共有多少人．
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (7/20)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">(13/20) / 2</gadget>
<output>13/40 = around 0.325</output>

<gadget id="calculator">(7/20) - (13/40)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">3 / (1/40)</gadget>
<output>120</output>

<result>120</result>