同学们做操，12个人排成一列，正好排15列。如果每列多排6个人，可排多少列？+Y3^,X,~4D/R2m2d,Y7j4R
算式：提示(]0@-_,A.z9i/|6U-}-Z4U+Y3^,X,~4D/R2m2d,Y7j4R
答：可排(}2C5p0_)`.\)R3y5E-Z1L,O-W5V)i.t0R列。+Y3^,X,~4D/R2m2d,Y7j4R