## iTiaax Group Title *MEDAL WILL BE AWARDED* The average of 5 numbers is 12. If a 6th number is added, what is the average? one year ago one year ago

1. ZeHanz Group Title

You'll have to know what number is added!

2. iTiaax Group Title

Really? :(

3. TedG Group Title

i was going to say, without the 6th number you cant do it

4. ZeHanz Group Title

Try it with an example: The average of 12, 12, 12, 12 and 12 (5 numbers) is ...12! Now add 12. Average is still 12. Instead, add 60. Average is 120/6=20. Makes a lot of difference.

5. tcarroll010 Group Title

If "x" is your 6th number, your average is:$\frac{ 60 + x }{ 6 }$This gives a real and useful answer, but of necessity has to be left in the form of a formula.

6. tcarroll010 Group Title

In case that Latex didn't come through: (x + 60) / 6

7. tcarroll010 Group Title

"60" is from: (x1 + x2 + x3 + x4 + x5)/5 = 12, so the sum is 60 for the first 5 numbers.

8. tcarroll010 Group Title

Making sense now, @iTiaax ?

9. iTiaax Group Title

Yes :) Thank you so much

10. tcarroll010 Group Title

You're quite welcome!

11. tcarroll010 Group Title

And thx for the recognition! @iTiaax ! Good luck in all of your studies!

12. iTiaax Group Title

No problem :) Good luck to you too!