RRB Junior Engineer Stage 1 Model Papers 7

Let the average of batsman after 11th innings =A

∴ Total score after 11th innings = 11 A
Now, ⇒11A+63=(A+2)×12
⇒11A–12A=24–63
⇒A=39
12th innings average =39+2=41
Alternate Method:
He is playing 12th inning increment made in all previous innings
Total increment =2×11=22 runs
His current score = 63
Required average + increment = current score
Required average =63–22=41