The ratio 9:7 gives you following statement:
- Carl will win in 9 cases from 9+7=16;
- Carl will lose in 7 cases from 16.
Then the probability that Carl will lose is

Answer: 
(3/4) / (1/6) =
3/4 * 6/1 =
18/4 =
4.5 miles per hr <==
The total price she paid for the shirt was $27.03