Maths Bond 10-11

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Tulip
Posts: 95
Joined: Thu Apr 08, 2010 11:28 pm
Location: London

Maths Bond 10-11

Post by Tulip »

Could anyone please help me on this question!!!!

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

Answer is 15
mitasol
Posts: 2756
Joined: Wed Feb 27, 2008 9:59 am

Re: Maths Bond 10-11

Post by mitasol »

The average of 4 numbers is 10 1/2
So the total of the 4 numbers is 4x10.5 = 42
If the average of 3 of them is 9
So the total of the 3 numbers is 3x9 =27

42-27=15
Tulip
Posts: 95
Joined: Thu Apr 08, 2010 11:28 pm
Location: London

Re: Maths Bond 10-11

Post by Tulip »

mitasol thanks for the response

much appreciated!!!! :D
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