Correct Answer - Option 4 : 24

**Given: **A cricketer scored 48 runs in the 7^{th} innings. His average score increased by 4.

**Formula: **Average of n numbers a1, a2, ... an = (a1 + a2 + ... + an)/n

**Calculation: **Let his average up to 7^{th} innings be x

(6x + 48)/7 = x + 4

⇒ 6x + 48 = 7x + 28

⇒ 20 = x

So, his average after 7^{th} innings is 20 + 4 = 24