6. A leaky valve on the water meter overcharges the residents for one gallon of water every 3 1/3 months.
The overcharged amount w varies directly with
time t. Find the equation that models this direct
variation. How many months it will take for the
residents to be overcharged for 9 gallons of water?

A. w = 3/10 t; 2 7/10 months

B. w= 3/10 t; 30 months

C. w= 10/3 t; 30 months

D. w= 10/3 t; 2 7/10 months