The young pioneers of class 41 donated money to the disaster area. 26 boys donated a total of 390 yuan, and 23 girls donated an average of 18 yuan. How much less did boys donate than girls?
四1班少先队员向灾区捐款，男生26人共捐款390元，女生23人，平均每人捐款18元，男生比女生平均每人少捐款多少元？
<gadget id="calculator">390 / 26</gadget>
<output>15</output>

<gadget id="calculator">18 - 15</gadget>
<output>3</output>

<result>3</result>