The total circumference of two circles is 25. 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?	Choose the correct choice from the following choices:  A) 5.7  B) 6.0  C) 4.0  D) 9.7  E) 18.0
Let r= Radius of smaller circle. Let R = Radius of larger circle   Therefore:   2πr + 2πR = 25   where 2r = R   Thus:   2πr + 4πr = 25   6πr = 25   r = approx 1.33   πR + 2Rπ = 25   3πR = 25   R = approx 2.65   r + R = approx 3.98 = 4.0   Answer : 4.0
<result>C</result>
The total circumference of two circles is 25. 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?