In the mid-term exam, Xiaoqiang took 4 homework, 78 points in Chinese, 83 points in natural science, 81 points in history, and 7 points more than the average score of the 4 homework in mathematics. How many points did you score in the math test?
小强期中考试，考了4门功课，语文78分，自然83分，历史81分，数学比4门功课的平均分多7分，数学考了多少分．
<gadget id="calculator">78 / 4</gadget>
<output>39/2 = around 19.5</output>

<gadget id="calculator">83 / 4</gadget>
<output>83/4 = around 20.75</output>

<gadget id="calculator">81 / 4</gadget>
<output>81/4 = around 20.25</output>

<gadget id="calculator">(39/2) + (83/4) + (81/4) + 7</gadget>
<output>135/2 = around 67.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(135/2) / (3/4)</gadget>
<output>90</output>

<result>90</result>