### 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 :

A. 35

B. 45

C. 55

D. 65

Let us take 30 students average marks = x Then, $\begin{array}{l}\text{30x + (3 × 85) = 60 × 65}\\ \text{x = 130 – 85}\\ \text{x = 45}\end{array}$