Answers

2015-02-04T22:00:11+08:00
Just cross multiply to get the equivalent number, simplify always 
example:
expressions            ratio         simplified    read as
150 km for 5 hours 150km:5h    30:1           30km/h
0
2015-02-04T22:16:20+08:00
EASY JUST crossed multiplication if the given is like this    3:6=9:n or 3\9=9\18.....
0