A book has 144 pages. The girl finished watching it in 8 days. Boys are going to finish reading in 12 days, how many more pages do girls read per day on average than boys?
一本书共有144页．女孩8天就看完了．男孩准备12天看完，女孩比男孩平均每天多看多少页？
<gadget id="calculator">144 / 8</gadget>
<output>18</output>

<gadget id="calculator">144 / 12</gadget>
<output>12</output>

<gadget id="calculator">18 - 12</gadget>
<output>6</output>

<result>6</result>