There are 14 classrooms in Sunshine Primary School, each classroom has 4 windows, and a total of 504 pieces of glass are installed. How many pieces of glass are installed on average for each window?
阳光小学有14间教室，每间教室有4个窗户，一共安装504块玻璃，平均每个窗户安装了多少块坡璃？
<gadget id="calculator">4 * 14</gadget>
<output>56</output>

<gadget id="calculator">504 / 56</gadget>
<output>9</output>

<result>9</result>