Multiple choice

There are 5 consecutive numbers in a list and their average is 23. If the next 5 consecutive numbers are also included in the list, what will be the average of all the ten numbers?

  1. 24

  2. 24.5

  3. 25.5

  4. 25

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average of 5 consecutive numbers is the middle number. If the average is 23, the numbers are 21, 22, 23, 24, 25. The next 5 are 26, 27, 28, 29, 30. The average of all 10 is (21+22+23+24+25+26+27+28+29+30)/10 = 255/10 = 25.5.