It's short in txt messages used as "by the way"
If he starts out with $25 and to enter is $5 then he will be left with $20. 0.80 per ride then he can ride 25 times by diving 20 by 0.80
Well I believe that the answer is five. Simply because 10 divided by 5 is 2 and -15 divided by 5 is -3