The mean of four numbers is $12$. When the greatest number is removed, the mean becomes $9$. What number was removed?

Question

Here's a question that I couldn't solve, apparently:

The mean of four numbers is $12$. When the greatest number is removed, the mean of the remaining three numbers is $9$. What number was removed?

Thanks so much if you can solve it! PS: You probably can. LOL :)

Aakash, you must show your efforts and where you are stuck. – Shailesh Nov 29 '18 at 03:32 — Shailesh, Nov 29 '18 at 03:32

score 2 · Answer 1 · answered Nov 29 '18 at 03:34

2

If you know the mean and the number of terms, you know the sum (mean=sum/# of terms). From the first sentence, you find the sum of four numbers. In the second sentence you get the sum of the remaining three. Can you take it from here?

answered Nov 29 '18 at 03:34

Andrei

37,370

Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)! – TECHron Nov 29 '18 at 03:50

The mean of four numbers is $12$. When the greatest number is removed, the mean becomes $9$. What number was removed?

1 Answers1