A track is in the form of a ring whose inner circumference is 352 m, and the outer circumference is 396 m. Find the width of the track

The correct answer is: 7 m

It is given that Circumference of inner circle = 352 m
2  r = 352
2  r  = 352
r  =  56 m
Circumference of outer circle = 396 m
2  r =   396
2  ×  r  = 3
r =  63 m
Width of the track
= Radius of outer circle – Radius of inner circle
=  63 – 56
=  7 m