Dad reads a book and reads 6 pages a day. After a week, there are still 38 pages left. How many pages does this book have?
爸爸看了一本书，每天看6页，一个星期后，还有38页没看，这本书共有多少页？
<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">42 + 38</gadget>
<output>80</output>

<result>80</result>