The inner circumference of a circular race track, 14 m wide, is 440 m. Find radius of the outer circle. Choose the correct choice from the following answers.
A) 84
B) 86
C) 82
D) 80
E) None of them
Let inner radius be r metres. Then, 2(22/7)r = 440 = r = (440 x (7/44))= 70 m.   Radius of outer circle = (70 + 14)= 
<gadget id="calculator">(70 + 14)</gadget>
<output>84</output>
84 m.   84nswer is 84
<result>A</result>
The inner circumference of a circular race track, 14 m wide, is 440 m. Find radius of the outer circle.