Hey!
To get an average of 260 for 5 games, the total must be:
[tex] 260 \times 5 = 1,300 [/tex]
The total must be 1,300. Add the 4 scores and see what it adds up to. Then subtract that from 1,300
[tex] 220 + 245 + 270 + 280 = 1,015 [/tex]
Subtract that from 1,300 to get your answer
[tex] 1,300 - 1,015 = 285 [/tex]
That means her score has to be 285
[tex] \framebox{Her score has to be 285 to get an average of 260} [/tex]
