Let the old average of the cricketer be n. ∴ New average of the cricketer =n+6 Total runs scored by the cricketer in 10 innings = 10n Total runs scored by the cricketer in 11 innings =10n+108 ∴11(n+6)=10n+108 ⇒11n–10n=108–66 ⇒n=42 ∴ New average of the cricketer=42+6=48