# Maths

• September 30th 2012, 06:13 AM
Spixol123
Maths
Mrs White has 3 children whose average age is 12 years, and her neighbour Mrs Green has 2 children whose average age is 7 years. the average age of the 5 children is?
• September 30th 2012, 06:20 AM
MarkFL
Re: Maths
Suppose you have an odd number...what must you add to it to get the next odd number?

edit: The problem was changed as I posted...
• September 30th 2012, 06:22 AM
Spixol123
Re: Maths
Thanks i worked that one out. My brain likes to confuse itself from time to time.
• September 30th 2012, 06:24 AM
Spixol123
Re: Maths
yeah i changed it because i worked that one out but now having troubles with this question?
• September 30th 2012, 06:26 AM
MarkFL
Re: Maths
Quote:

Originally Posted by Spixol123
Mrs White has 3 children whose average age is 12 years, and her neighbour Mrs Green has 2 children whose average age is 7 years. the average age of the 5 children is?

First, I recommend posting problems in the appropriate forums. They will get more attention that way.

For this problem, you may use a weighted average to find the mean of the ages $\bar{A}$ for the five children:

$\bar{A}=\frac{3(12)+2(7)}{3+2}=?$
• September 30th 2012, 07:13 AM
Spixol123
Re: Maths
10. thanks mate Great help and will start posting in appropriate forums