Class A has 25 students and Class B has 75 students. The total average score of Class A and Class B is 90 points. If the average score of Class A is 5 points higher than the average score of Class B, what is the average score of Class B?
甲班有25人，乙班有75人．甲班和乙班的总平均分是90分，如果甲班的平均分比乙班的平均分高5分，那么乙班的平均分是多少？
<gadget id="calculator">90 * 25</gadget>
<output>2_250</output>

<gadget id="calculator">90 * 75</gadget>
<output>6_750</output>

<gadget id="calculator">5 * 25</gadget>
<output>125</output>

<gadget id="calculator">6_750 - 125</gadget>
<output>6_625</output>

<gadget id="calculator">2_250 + 6_625</gadget>
<output>8_875</output>

<gadget id="calculator">75 + 25</gadget>
<output>100</output>

<gadget id="calculator">8_875 / 100</gadget>
<output>355/4 = around 88.75</output>

<result>355/4 = around 88.75</result>