Question

the sum of radii of two circles is 140 cm and difference of their circumferences is 88 cm . Find the diameters of the circles

Answer 1

circumference is pi *2r
let radius be r,r1
circumference=2pi[r-r1]=88
r-r1=88/2=44/22*7
=14

x+x+14= 140
so x=63,77
so diameter=126,154cm

Answer 2

x+y=140. (I) 2*pi*x -(2piy)=88 X-y=14 (taking pi to right hand side). (II) (I)+(II) =2x=144 x=72 y=58