There are 25 boys and 24 girls in class 304, and each of them will be given 3 homework books. How many homework books should they prepare in total?
304班有男生25人，女生24人，每人发3个作业本，一共要准备多少个作业本？
<gadget id="calculator">25 + 24</gadget>
<output>49</output>

<gadget id="calculator">49 * 3</gadget>
<output>147</output>

<result>147</result>