There are 8 small blackboards in the classroom. If 4 are added, it will be exactly 4 times the size of the big blackboard. How many blackboards are there in the classroom?
教室里有小黑板8块，如果增加4块，正好是大黑板的4倍，教室里一共有几块黑板？
<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 + 8</gadget>
<output>11</output>

<result>11</result>