The number of boys in a school (6/11) is equal to the number of girls (7/13), and the number of boys (1/7) is 4 less than the number of girls (1/6). How many students are there in this school?
某校男生人数的(6/11)等于女生人数的(7/13)，男生人数的(1/7)比女生人数的(1/6)少4人，这个学校共有学生多少人？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">77 + 78</gadget>
<output>155</output>

<gadget id="calculator">78 / 155</gadget>
<output>78/155 = around 0.503226</output>

<gadget id="calculator">(1/6) * (78/155)</gadget>
<output>13/155 = around 0.083871</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">77 / 155</gadget>
<output>77/155 = around 0.496774</output>

<gadget id="calculator">(1/7) * (77/155)</gadget>
<output>11/155 = around 0.070968</output>

<gadget id="calculator">(13/155) - (11/155)</gadget>
<output>2/155 = around 0.012903</output>

<gadget id="calculator">4 / (2/155)</gadget>
<output>310</output>

<result>310</result>