The inner circumference of a circular race track, 25 m wide, is 880 m. Find radius of the outer circle?
Answers.
A) 165 m	B) 120 m	C) 100 m	D) 190 m	E) 220 m

Rationale: "let inner radius be r metres . then , 2 π r = 880 ⇔ r = ( 880 x ( 7 / 44 ) ) = 140 m . radius of outer circle = ( 140 + 25 ) m = 165 m . hence a"
Answer: A