Question

A inner circumference of a circular track is 220m.A path 7m wide runs around the track.Find the cost of fencing outer cricle at Rs.2 per meter?

Answer 1

here the circumference of the inner circle= 220m .
then, radius =
$2 \times 22 \div 7 \times x = 220$
then x= 35 m
then radius of outer circle = 35+7m=42 cm
then circumference of the outer circle =
$2\pi \times x$
= 264 m
then, required cost =
$264 \times 2$
= Rs 528