Xiaoshuang read a storybook, on average, 12 pages per day in the first 3 days, and 7 more pages per day in the last 4 days. How many pages do you read on average each day?
小双读一本故事书，前3天平均每天读12页，后4天平均每天多读7页．这几天平均每天读多少页？
<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<gadget id="calculator">12 + 7</gadget>
<output>19</output>

<gadget id="calculator">4 * 19</gadget>
<output>76</output>

<gadget id="calculator">36 + 76</gadget>
<output>112</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">112 / 7</gadget>
<output>16</output>

<result>16</result>