The average score of the class in a math test was 95, and Xiao Ming scored 98, which Mr. Zhang recorded as +3. Xiaoliang scored 91 points in the test, so what is the score for Mr. Zhang?
一次数学测验全班平均95分，小明考了98分，张老师记作+3分．小亮考了91分，那么张老师记作多少分．
<gadget id="calculator">95 - 91</gadget>
<output>4</output>

<result>4</result>