total of 88 teachers and students, 4 fewer male students than female students, participated in the construction of the school and moved bricks together. On average, each male student moved 100 bricks, each female student moved 80 bricks, and each teacher moved 110 bricks , The teacher and the students move a total of 840 bricks, how many teachers participated.
老师和学生一共88人，男同学比女同学少4人，一同参加建校搬砖劳动，平均每个男同学搬砖100块，每个女同学搬砖80块，每个老师搬砖110块，老师和学生一共搬砖840块，求参加的老师有多少人．
<gadget id="calculator">4 * 80</gadget>
<output>320</output>

<gadget id="calculator">88 * 110</gadget>
<output>9_680</output>

<gadget id="calculator">4 * 110</gadget>
<output>440</output>

<gadget id="calculator">9_680 - 440 - 8_040</gadget>
<output>1_200</output>

<gadget id="calculator">320 + 1_200</gadget>
<output>1_520</output>

<gadget id="calculator">110 - 100 - 80</gadget>
<output>-70</output>

<gadget id="calculator">110 + (-70)</gadget>
<output>40</output>

<gadget id="calculator">1_520 / 40</gadget>
<output>38</output>

<gadget id="calculator">38 + 38 + 4</gadget>
<output>80</output>

<gadget id="calculator">88 - 80</gadget>
<output>8</output>

<result>8</result>