The library distributes 850 books to each grade, with 105 books distributed to each grade from grades one to five, and the rest distributed to grades six. How many books are assigned to the sixth grade?
图书室把850本图书分给各个年级，一至五年级每个年级分得105本，其余的分给六年级．六年级分得多少本图书？
<gadget id="calculator">105 * 5</gadget>
<output>525</output>

<gadget id="calculator">850 - 525</gadget>
<output>325</output>

<result>325</result>