Question

if a:b=7:9and b:c=5:7, then find the value of a:c?

Answer 1

a:b
b:c
= 7:9
5:7
multiply 5 with 7 and 9 and then 9 with 5 and 7
so we get

35:45
45:63
=> 35:45:63 is a:b:c
now a:c should be 35:63