Xiao Mao reads a 260-page book. He reads 25 pages a day for the first 8 days, and reads 30 pages on the 9th day. How many pages are left?
小毛看一本260页的书，他前8天每天看25页，第9天看了30页，还剩多少页没看？
<gadget id="calculator">25 * 8</gadget>
<output>200</output>

<gadget id="calculator">260 - 200 - 30</gadget>
<output>30</output>

<result>30</result>