Lili reads an extra-curricular book. She reads 68 pages in the first four days and 72 pages in the last three days. How many pages does Lili read on average every day? what is the correct formula
丽丽看一本课外书，前四天共看68页，后三天看72页，丽丽平均每天看多少页？正确的算式是多少
<gadget id="calculator">68 + 72</gadget>
<output>140</output>

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

<gadget id="calculator">140 / 7</gadget>
<output>20</output>

<result>20</result>