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if $a^2bc^3 = 25$ and $ab^2= 5$, how would you find $abc$?

Is there a formula of which these are a part of? What I've done is this:

$abc^3 = \frac{25}a\quad\implies\quad abc = \frac{25}{ac^2}$

But how would I use the $ab^2$?

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    @Brian M. Scott Thanks, I'll sure take a look at that2012-12-11

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Note that $\left(a^2bc^3\right)\left(ab^2\right)=a^3b^3c^3=(abc)^3$. Can you finish it from here?