I bought a 4-point X sticker. The column equation is 4x+( 100-x)*8=680 6 yuan 8 angle =680 minutes.

Solution: 4x+800-8x=680

-4x=680-800

x= 120/4

x=30

The score of 8 is: 100-30=70 (sheets)

A: 30 4-point cards. Seventy eight-cent tickets.