Kobayashi took four homework exams, with a score of 78 in Chinese, 83 in science, and 51 in English. His math score was 7 points higher than the average score of the four subjects. Ask: How many points did you get in the math exam?
小林其中考试考了四门功课，语文78分，科学83分，英语51分，数学得分比四科的平均分多7分，问：数学考试得了多少分．
<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">51 / 4</gadget>
<output>51/4 = around 12.75</output>

<gadget id="calculator">(39/2) + (83/4) + (51/4) + 7</gadget>
<output>60</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">60 / (3/4)</gadget>
<output>80</output>

<result>80</result>