Question

If A:B = 2:3 , B:C = 4:5 than C:A= ?

Answer 1

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a/ b = 2/3 &. b/ c = 4/5

3a = 2b 5b= 4c------1)
b = 3a/2-----2)

Put value of b in (1)

=)4c = 5 ( 3a/2)

=)4c = 15/2a

=)8c = 15/a

=)8/15 = a/c

=)a / c =8/15

=)a:c = 8:15


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Answer 2

A:B=2:3
B:C=4:5
Since B is common 
A:B=2:3*4
B:C=4:5*3
A:B=8:12
B:C=12:15
A:B:C=8:12:15
therefore C:A=15:8

Hope it helped^^