math
posted by p .
1. Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $123.00 for 3 days and 300 miles, while Mary was charged $216.00 for 5 days and 600 miles. What does Best Rental charge per day, for mileage?

math 
Steve
break it down line by line to set up your equations.
using d for daily charge and m for mileage charge,
Barney: 3d + 300m = 123
Mary: 5d + 600m = 216
Subtract M from 2*B:
d = 30
so, m = .11
check: 3*30 + 300*.11 = 90+33 = 123
5*30 + 600*.11 = 150+66 = 216
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