There are 186 balls in the school sports room. There are 5 classes in the fifth grade. Each class borrows 18 balls. The rest are lent to the 4 classes in the fourth grade. How many balls do each class borrow on average?
学校体育室一共有186只球，五年级5个班，每班借了18只球，剩下借给四年级的4个班，平均每班借多少球？
<gadget id="calculator">18 * 5</gadget>
<output>90</output>

<gadget id="calculator">186 - 90</gadget>
<output>96</output>

<gadget id="calculator">96 / 4</gadget>
<output>24</output>

<result>24</result>