The students donated books to the students in the disaster area, 210 students in the fourth grade, with an average of 3 books per person, and 240 students in the fifth grade, with an average of 5 books per person. How many more books should the fifth grade donate than the fourth grade?
同学们为灾区学生捐书，四年级210人，平均每人捐3本，五年级240人，平均每人捐5本．五年级比四年级多捐多少本？
<gadget id="calculator">240 * 5</gadget>
<output>1_200</output>

<gadget id="calculator">210 * 3</gadget>
<output>630</output>

<gadget id="calculator">1_200 - 630</gadget>
<output>570</output>

<result>570</result>