The total circumference of the two circles is 36. If the first circle has a circumference that is exactly twice the circ

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The total circumference of the two circles is 36. If the first circle has a circumference that is exactly twice the circumference of the second circle, then what is the approximate sum of their two radii?

A) 5.7
B) 6.0
C) 6.7
D) 9.7
E) 18.0

Answer: A

Source: EMPOWERgmat
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