Question

The average of 11 numbers arranged in an order is 41. The average of the first five numbers is 18 and that of the last five numbers is 64. What is the sixth number?

• A. 41
• B. 45
• C. 55
• D. 64

Answer 1

Answer:

A. 41

Sum of 11 numbers = 11 × 41 = 451; Sum of first five numbers = 5 × 18 = 90;

Sum of last five numbers = 5 × 64 = 320; Sixth number = 451 - (90 + 320) = 41.