A storybook has 565 pages. Xiao Lin read it for 3 days, with an average of 105 pages per day. How many pages are left?
一本故事书565页，小林看了3天，平均每天看105页，还有多少页没有看完？
<gadget id="calculator">3 * 105</gadget>
<output>315</output>

<gadget id="calculator">565 - 315</gadget>
<output>250</output>

<result>250</result>