Question

If 2a=3b and 4b=5c find a:c

Answer 1

2a/3=b
put in second equation
4b=5c
4×2a=3×5c
8a=15c
a/c=15/8
a:c=8:15

Answer 2

2a=3b
2a/3=b
4b=5c
4 (2a/3)=5c
8a/3=5c
8a=15c
a/c=15/8
=a:c=15:8