Let us assume the total number of bowls of cereal that Nathan has eaten in a year = x
With each bowl of cereal, Nathan has 1/18 gallon of Milk.
In total the number of gallons of mulk in a year = 8 gallons,
Therefore, we frame the equation as shown below to calculate "x"
1/18 * x = 8
x = 18*8 = 144
Number of bowls of cereal Nathan ate in a year = 144 bowls