Xiao Min and Xiao Qiang went to a certain field to participate in social practice during their holidays. This factory uses whiteboard paper as packaging box, and each whiteboard paper is designed to make two boxes or three lids, and two lids in a box just make a packaging box. In order to make full use of materials, it is required that the box body and the box cover are just matched.

Solution: Set X pieces of paper as the box. (14-x) Paper is used as the box cover.

2X2x=3( 14-x)

4x=42-x

X=6 2x=6X2= 12 Hope to adopt ~ ~ ~