Xiaohong borrowed a 200-page fairy tale. She reads 25 pages a day. After a week, how many pages are left?
小红借了一本200页的童话故事，她每天看25页，一个星期后，还剩多少页没有看？
<gadget id="calculator">25 * 7</gadget>
<output>175</output>

<gadget id="calculator">200 - 175</gadget>
<output>25</output>

<result>25</result>