There are 21 girls and 25 boys in class 31. On average, each child does 16 paper crafts. How many paper crafts do boys do more than girls?
三1班有21名女生，25名男生，平均每个小朋友做16个纸工，男生比女生多做多少个纸工？
<gadget id="calculator">25 * 16</gadget>
<output>400</output>

<gadget id="calculator">21 * 16</gadget>
<output>336</output>

<gadget id="calculator">400 - 336</gadget>
<output>64</output>

<result>64</result>