Question

a:b=2:3
b:c= 5:6
Show that a:c=5:9
please help

Answer 1

a/b = 2/3
= 10\15
b/c = 5/6 = 15/18
a/b/c/b = a/c = 10/15/18/15 = 10/18
=5/9
Hence proved