Answer:
2.5
Explanation:
(I'm assuming you're doing this the same way I learned it, if not I'm sorry if it doesn't make sense)
=

Cross multiply
12x=30
Divide
x=2.5
This is just one way to do the problem. An easier way is to simplify the fractions.
=

You can either cross multiply or figure out that 2 is half of four and simply divide 5 by 2 which will also result in 2.5