The inner circumference of a circular race track, 14m wide is 440m. Find the radius of the outer circle.  Choose the correct choice from the following:
A) 84  B) 12  C) 67  D) 28  E) 21
Explanation:   let inner radius be r meters.   {\color{Black} Then,2\Pi r=440\Rightarrow r=440\times \frac{7}{22}\times \frac{1}{2}=70m}   Radius of outer circle = 70 + 14= 
<gadget id="calculator">70 + 14</gadget>
<output>84</output>
84m   84nswer: 84) 84m
<result>A</result>
The inner circumference of a circular race track, 14m wide is 440m. Find the radius of the outer circle.