In the fourth grade, 33 girls and 1/7 boys were selected to participate in the mathematics competition. The number of remaining boys was twice the number of girls. We also know that there are 7 more boys than girls. How many students are there in the fourth grade?
四年级选出女生33人和男生的(1/7)参加数学竞赛，剩下的男生人数是女生人数的2倍，又知男生比女生多7人，四年级共有学生多少？
<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">33 * 2</gadget>
<output>66</output>

<gadget id="calculator">14 + 66</gadget>
<output>80</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2 - (6/7)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">80 / (8/7)</gadget>
<output>70</output>

<gadget id="calculator">70 - 7</gadget>
<output>63</output>

<gadget id="calculator">63 + 70</gadget>
<output>133</output>

<result>133</result>