Posted by **Joseph** on Friday, September 30, 2011 at 3:10am.

To a class of 28 pupils, 12 new pupils whose average age is 10 months less than the average age of the 28 are added. By how many months is the average age of the whole class lowered?

- Math -
**Reiny**, Friday, September 30, 2011 at 9:13am
Please do not repost the same question, while your previous post still shows up on the page.

Also be aware that most of our volunteer tutors live within a few hours of the above time-zone, so at 3:10 am most of us are probably sleeping.

http://www.jiskha.com/display.cgi?id=1317364121

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