*MEDAL WILL BE AWARDED*
The average of 5 numbers is 12. If a 6th number is added, what is the average?

Question

*MEDAL WILL BE AWARDED*
The average of 5 numbers is 12. If a 6th number is added, what is the average?

zehanz · Answer

You'll have to know what number is added!

itiaax · Answer

Really? :(

anonymous · Answer

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

zehanz · Answer

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.

anonymous · Answer

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.

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

Making sense now, @iTiaax ?

itiaax · Answer

Yes :) Thank you so much

anonymous · Answer

You're quite welcome!

anonymous · Answer

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

itiaax · Answer

No problem :) Good luck to you too!