There are three classes in the sixth grade of Hope Primary School, and the number of each class is equal. The number of boys in class 1 is equal to the number of girls in class 2. The ratio of boys to girls in class 3 is 5:7. It is known that there are 76 girls in the sixth grade. How many students are there in the whole grade?
希望小学六年级共有三个班，每班人数相等，其中一班男生人数与二班女生人数相等，三班男生与女生的人数比是5：7．已知六年级女生有76人，全年级共有学生多少人？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(7/12) * (1/3)</gadget>
<output>7/36 = around 0.194444</output>

<gadget id="calculator">(1/3) + (7/36)</gadget>
<output>19/36 = around 0.527778</output>

<gadget id="calculator">76 / (19/36)</gadget>
<output>144</output>

<result>144</result>