A book of "Fairy Tales" has 200 pages, and Xixi reads 35 pages every day for 5 days, how many pages are left.
一本《童话故事》有200页，西西每天看书35页，看了5天，还剩多少页．
<gadget id="calculator">35 * 5</gadget>
<output>175</output>

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

<result>25</result>