Question

if a : b equal to 2 : 3 b : c is equal to 4 : 5 then c : a is ?

Answer 1

a:b=(2:3)×4:4

b:c=(4:5)×3:3

a:b=8:12

b:c=12:20

a:c=8:20

a:c=2:5
c:a=5:2