The team manager poured a total of 10 gallons of water into 15 bottles in equal amounts. Which equation shows how to calculate the number of gallons per bottle?
A. g = 10 gallons X 15 bottles
B. g = 10 gallons ÷ 15 bottles
C. g = 15 bottles ÷ 10 gallons
D. g = 10 gallons + 15 bottles