In this year's "Giving Love" activity, 6 classes in the third grade donated 900 books in total, 5 of which donated 145 books each, and how many books did the other class donate?
在今年的"献爱心"活动中，三年级6个班共捐书900本，其中5个班各捐了145本，另一个班捐了多少本？
<gadget id="calculator">145 * 5</gadget>
<output>725</output>

<gadget id="calculator">900 - 725</gadget>
<output>175</output>

<result>175</result>