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 Post subject: Maths Bond 10-11Posted: Fri Aug 20, 2010 5:01 pm

Joined: Thu Apr 08, 2010 10:28 pm
Posts: 95
Location: London

The average 4 numbers is 10 1/2
If the average of 3 of them is 9 what is the 4th number????

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 Post subject: Re: Maths Bond 10-11Posted: Fri Aug 20, 2010 6:18 pm

Joined: Wed Feb 27, 2008 8:59 am
Posts: 2078
Quote:
The average of 4 numbers is 10 1/2

So the total of the 4 numbers is 4x10.5 = 42
Quote:
If the average of 3 of them is 9

So the total of the 3 numbers is 3x9 =27

42-27=15

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 Post subject: Re: Maths Bond 10-11Posted: Fri Aug 20, 2010 8:21 pm

Joined: Thu Apr 08, 2010 10:28 pm
Posts: 95
Location: London
mitasol thanks for the response

much appreciated!!!!

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