A batsman scores 87 runs in the $$21^{st}$$ match of his career. His average runs per match increases by 2. What was his average before the $$21^{st}$$ match.
Sum of scores till 20 matches=S
average of 20 matches=x
S=20x
(S+87)/21 =x+2
20x+87=21x+42
x=45
Create a FREE account and get:
