Wang Qiang's average score in the three subjects of Chinese, mathematics, and English in the mid-term examination was 85 points, 87 points in mid-term Chinese, and 90 points in mathematics. What is his English score?
王强同学期中考试语文、数学、英语三科的平均成绩是85分，期中语文87分，数学90分．他的英语是多少分？
<gadget id="calculator">85 * 3</gadget>
<output>255</output>

<gadget id="calculator">255 - 87 - 90</gadget>
<output>78</output>

<result>78</result>