The average marks obtained by a class of 60 students is

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The average marks obtained by a class of 60 students is 65. The average marks of half of the students is found to be 85. The average marks of the remaining students is

1. 35
2. 45
3. 55
4. 65

Correct Option: B

Let average marks of remaining 30 students be p.

∴ 65 =	30 × 85 + 30 × p
	60

⇒ 65 × 60 = 2550 + 30p
⇒ 3900 = 2550 + 30p
⇒ 30p = 3900 – 2550 = 1350

⇒ p =	1350	= 45
	30