Question

The average of 11 numbers is 30. The average of the first six numbers is 28 and the average of the last six numbers is 32. Find the sixth number.

• A. 32
• B. 27
• C. 34
• D. 30

Answer 1

Answer:

D. 30

Sum of 11 numbers = 30 × 11 ⇒ 330 Sum of first six numbers = 28 × 6 ⇒ 168 Sum of last six numbers = 32 × 6 ⇒ 192 Sixth number = {(168 + 192) – 330} ⇒ {360 – 330} ⇒ 30