Multiple choice

The average of 10 numbers is 17.3. If the average of first five numbers is 14.2 and the average of last six numbers is 19.4. What is the fifth number?

  1. 14.4

  2. 12

  3. 13.8

  4. 17.8

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sum of 10 numbers = 10×17.3 = 173. Sum of first 5 = 5×14.2 = 71. Sum of last 6 = 6×19.4 = 116.4. The 5th number is counted in both first-5 and last-6 groups. So 71 + 116.4 - 5th = 173, 5th = 187.4 - 173 = 14.4. Answer A is correct.

Keep practicing — related questions