The New Year is coming, I hope that the students in the fourth grade of elementary school want to fold 800 paper cranes to give to the children in the disaster area. They have already folded 420, and the rest will be completed by 19 students. How many paper cranes does each student have to fold on average?
新年快到了，希望小学四年级的同学们想折800只纸鹤送给灾区的小朋友，他们已经折好了420只，剩下的由19位同学完成，平均每位同学还要折多少只？
<gadget id="calculator">800 - 420</gadget>
<output>380</output>

<gadget id="calculator">380 / 19</gadget>
<output>20</output>

<result>20</result>