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?

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- Sep 30th 2012, 06:13 AMSpixol123Maths
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?

- Sep 30th 2012, 06:20 AMMarkFLRe: 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... - Sep 30th 2012, 06:22 AMSpixol123Re: Maths
Thanks i worked that one out. My brain likes to confuse itself from time to time.

- Sep 30th 2012, 06:24 AMSpixol123Re: Maths
yeah i changed it because i worked that one out but now having troubles with this question?

- Sep 30th 2012, 06:26 AMMarkFLRe: Maths
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 $\displaystyle \bar{A}$ for the five children:

$\displaystyle \bar{A}=\frac{3(12)+2(7)}{3+2}=?$ - Sep 30th 2012, 07:13 AMSpixol123Re: Maths
10. thanks mate Great help and will start posting in appropriate forums