A storybook has 230 pages in total, Dongdong reads 25 pages every day, how many pages are left after a week?
一本故事书共230页，东东每天看25页，一星期后还剩多少页没有看？
<gadget id="calculator">25 * 7</gadget>
<output>175</output>

<gadget id="calculator">230 - 175</gadget>
<output>55</output>

<result>55</result>