You were billed $17.60 for water usage at a rate of $0.55 per gallon. Three choices are correct ways to calculate the the number of gallons, g, of water that you used. Which choice is NOT?

a) 17.6 = 0.55 • g

b) 17.60/55 = g

c) 0.55g = 17.6

d)0.55/g = 17.6