The average of five numbers is 7. If three new numbers would be added, then the new average comes out to be 8.5. What is the average of those three new numbers ?

A. 9

B. 10.5

C. 11

D. 11.5

Answer: Option C

Solution(By Examveda Team)

Sum of 5 numbers = 7 × 5 = 35
Sum of 8 numbers = 8.5 × 8 = 68
Sum of added all three numbers = 68 - 35 = 33
Average of three new numbers = $$\frac{33}{3}$$ = 11