DRDO Multi tasking staff Model paper 4

⇒ Correct average = (marks of rest 57 students + 26)/58
⇒ Incorrect average = 24 = (marks of rest 57 students + 6)/58
Subtracting both,
⇒ Correct average – 24 = (marks of rest 57 students + 26)/58 - (marks of rest 57 students + 6)/58
⇒ Correct average = 24 + (26 – 6)/58
∴ Correct average = 24 + 20/58 = 1412/58 = 706/29