The fourth and fifth grades of Lixin Primary School carried out the "Learn from Lei Feng and do good deeds" activity, with an average of 4 good deeds per person. There are 50 students in the fourth grade, and a total of 155 good deeds. There are 45 students in the fifth grade, how many good deeds do each person have on average?
立新小学四、五年级开展"学雷锋做好事"活动，平均每人做好事4件．四年级50人，共做好事155件．五年级45人，平均每人做好事多少件？
<gadget id="calculator">50 + 45</gadget>
<output>95</output>

<gadget id="calculator">4 * 95</gadget>
<output>380</output>

<gadget id="calculator">380 - 155</gadget>
<output>225</output>

<gadget id="calculator">225 / 45</gadget>
<output>5</output>

<result>5</result>