SOLUTION: How do I solve the radius of a circle of two circles together one outer and one inner if the radius of the smaller circle is 3 units less than r?

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Question 985123: How do I solve the radius of a circle of two circles together one outer and one inner if the radius of the smaller circle is 3 units less than r?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
How is this description instead:

Two concentric circles the radius of the larger being r and the radius of the smaller being r-3.

What question have you for the description? Does this exercise have more information?