A story book has 80 pages in total. Xiao Ming has been reading it for a week and reads 6 pages a day. How many pages does Xiao Ming not read?
一本故事书一共有80页，小明已经看了一个星期，每天看6页，小明还有多少页没有看？
<gadget id="calculator">80 - 42</gadget>
<output>38</output>

<result>38</result>