Posted by Denis Borris on October 01, 2002 at 03:27:03:
In Reply to: Problem posted by Sol on September 30, 2002 at 23:51:50:
: Am having an issue with a problem here:
: The average of 6 numbers is 19. A seventh number is added and the new
: average is 20. What is the 7th number?
What does "having an issue" mean ????
If average of 6 numbers is 19, then these numbers add up to 19*6 = 114;
do you understand that?
As example, average of numbers 2 and 4 is 3, right? And 2*3 = 6 (the sum).
7th number increases average to 20 : so your new sum is 7*20 = 140.
Therefore, 26 is the 7th number: 114 + 26 = 140. OK??